When the Texas summer heat hits, the universal cure is an inner tube, a cooler, and a cold spring-fed river. In Central Texas, the two most popular floats are the Comal River and the San Marcos River. Both run crystal-clear 72°F water year-round — but they deliver very different days on the water.
The Comal River is a short, urban, highly engineered float governed by strict New Braunfels ordinances. The San Marcos River, by contrast, runs longer through scenic country and has far looser rules. This guide breaks down route, logistics, and the all-important container laws so you can pick the right river for your group — and, if you're choosing the calm side, points you to San Marcos River glamping at Son's Blue River Camp in Kingsbury.
Choosing Your Central Texas River Float: Comal vs. San Marcos
Both rivers originate from subterranean aquifers, so the water stays clean, clear, and cool even when summer temperatures break 100°F. Where they diverge is geography and law. The Comal sits entirely inside New Braunfels city limits — short, fast-paced, commercialized. The San Marcos starts in the city of San Marcos but quickly winds into open country bordered by bald cypress and private ranches.
The Comal River Tubing Experience: What to Expect
The Comal River holds the title of shortest navigable river in Texas, running about 2.5 miles before merging with the Guadalupe. Fed by Comal Springs inside the Edwards Aquifer, the water is famously clear. Because the river is so short, a typical comal river tubing trip runs 2–3 hours depending on flow and crowds. The float runs through downtown New Braunfels, so you're floating past retaining walls, parks, and back decks — not wilderness.
Key Milestones: From the Tube Chute to the Last Tubers Exit
- Prince Solms Park & the Tube Chute. Most tubers put in at Prince Solms Park and hit the New Braunfels Tube Chute almost immediately — a concrete dam slide that flips tubes and demands strong swimming.
- The Schlitterbahn bypass. The river drifts past Schlitterbahn Waterpark; calm water, but heavy traffic on peak weekends.
- Last Tubers Exit (Union Avenue). Standard exit. Miss it and you continue into the rougher Guadalupe confluence.
Planning Your Comal Float: Parking, Shuttles, and Outfitters
Comal logistics get tight on summer weekends. City lots near the river charge premium rates. Most floaters use commercial outfitters that bundle parking, tube rentals, and shuttle loops:
- Texas Tubes — direct river access and an efficient shuttle loop.
- Comal Tubes — straightforward rentals near key access points.
- Rockin' R River Outfitters — multi-river provider built for large groups.
Monitoring Flow Levels & USGS Safety Guidelines
Comal speed, duration, and safety are dictated by flow rate (cfs), tracked by the USGS:
- Under 100 cfs: slow and family-friendly — expect to hand-paddle flat sections.
- 100–250 cfs: the sweet spot — steady, fun drift.
- Over 300 cfs: fast water; advisories possible; jackets often required for kids and weak swimmers.
- Flood threshold: the city closes public access entirely.
The Critical Difference: Rules & Container Laws Compared
The single biggest factor when choosing between these rivers is the local ordinance. New Braunfels enforces a strict "Can Ban" on the Comal: no disposable containers — no aluminum cans, plastic bottles, glass, baggies, or paper wrappers. Violations bring real fines.
| Rule | Comal River (New Braunfels) | San Marcos River (Kingsbury) |
|---|---|---|
| Disposable containers | Strictly prohibited | Cans & bottles allowed (no glass) |
| Cooler requirements | Must latch; 1 per person | Standard coolers welcome |
| Container types | Reusable only (flasks, tumblers) | Cans, bottles, reusable — all OK |
| Volume limits | 30-quart cooler max | No strict volume limit |
| Alcohol (21+) | Reusable containers only, no glass | Cans allowed, no glass |
The San Marcos River: A Scenic, Less Crowded Alternative
The San Marcos is also spring-fed — originating from Spring Lake in San Marcos and staying a constant 72°F. As it flows southeast toward Martindale and Kingsbury, the landscape opens into towering bald cypress, lush banks, and wide Texas sky. Because the lower river is outside major city limits, the strict Comal can ban doesn't apply. Bring standard cans, pack out trash, and float.
Ditching the Crowds at Son's Blue River Camp in Kingsbury
If you want the best of the San Marcos without public-park parking scrambles, Son's Blue River Camp in Kingsbury is the easy answer. It's a private riverfront resort with direct access to a quieter stretch of the river:
- On-site tubing & kayaking with shuttle — no off-site staging.
- Day-use riverfront cabanas instead of crowded public beaches.
- Overnight glamping cabins, log cabins, and tent sites — extend the trip.
- Family-friendly managed property, relaxed and uncrowded.
Driving from out of town? See our Austin river day trip and San Antonio river day trip guides, or explore the Sons Getaways family of Texas river camps.
The Verdict: How to Choose Which River to Float
Choose Comal River tubing if you want a short, fast urban float, the Tube Chute thrill, and you don't mind transferring drinks into reusable tumblers and floating shoulder-to-shoulder.
Choose the San Marcos (and Son's Blue River Camp) if you want a longer, scenic, peaceful float, standard cans and coolers, private parking, shaded cabanas, and the option to walk out of an A/C glamping cabin straight to the water.
Comal River Tubing FAQs
How long does a Comal River tubing float usually take?
A typical tubing trip on the Comal River is relatively brief, usually lasting between 2 to 3 hours. The exact duration depends on the current water flow rate and how many other floaters are sharing the water.
Where does the Comal River float start and end?
For most tubers, the float begins near Prince Solms Park, where you immediately encounter the famous Tube Chute. The standard exit point for most public and commercial floats is the Last Tubers Exit at Union Avenue. Missing this exit leads you into the rougher confluence of the Guadalupe River.
Where can I park and catch a shuttle for Comal River tubing?
City-owned lots close to the river charge premium weekend rates, so most visitors use local commercial outfitters like Texas Tubes, Comal Tubes, and Rockin' R River Outfitters for parking, tube rentals, and shuttle service.
What rules apply to containers and coolers on the Comal River?
New Braunfels enforces a strict "Can Ban" on the Comal River. No disposable containers — cans, plastic bottles, glass, baggies, or paper wrappers. Coolers must latch, cap at 30 quarts, and one per person.
Are aluminum cans and plastic bottles allowed on the Comal River?
No. Under New Braunfels city ordinances, aluminum cans and plastic bottles are prohibited on the Comal. Only reusable containers like metal flasks, thermoses, or reusable tumblers are permitted.
How do river flow levels affect whether the Comal River is open or safe?
Flow is measured in cubic feet per second (cfs). Under 100 cfs the river is calm and slow; 100–250 cfs is ideal; over 300 cfs the river runs fast and safety advisories may be issued. Floodwater closes public access entirely.
Do I need a life jacket on the Comal River, and is it safe for kids?
Calm flows under 100 cfs are family-friendly. At 300+ cfs life jackets are highly recommended — sometimes mandatory — for kids and weak swimmers. The Tube Chute near the start can flip tubes and requires strong swimming skills.
Which outfitters offer rentals and shuttles on the Comal River?
Prominent Comal outfitters include Texas Tubes (direct river access, rentals, and shuttle loop), Comal Tubes (near key access points), and Rockin' R River Outfitters (multi-river provider for large groups).
San Marcos River Tubing FAQs
How long does a San Marcos River tubing float usually take?
A single lap on the San Marcos at Son's Blue River Camp takes about 90 minutes of river time at typical summer flows. The Ultimate River Fun Wristband includes unlimited re-floats with shuttle, so most groups go around two or three times in a day rather than calling it after one lap.
Where does the San Marcos River float start and end?
Son's Blue River Camp is the float take-out, not the put-in. After you check in, our shuttle takes you upriver to our sister property, Son's River Ranch, where you launch. From there you float a scenic stretch of the San Marcos and drift right back to Son's Blue River Camp — straight to your cabana, glamping cabin, or vehicle. Shuttles run continuously from 10:30 a.m. to 6:30 p.m., and the Ultimate River Fun Wristband lets you tube and kayak all day for one flat price.
Where can I park and catch a shuttle for San Marcos River tubing?
Parking at Son's Blue River Camp is free when you rent a riverfront cabana, glamping cabin, log cabin, picnic table, or tent spot — two vehicles per reservation are included. If you're just coming to float for the day without a rental, day-use parking is $20 per car. The shuttle from the Son's Blue River Camp take-out up to the Son's River Ranch put-in runs continuously from 10:30 a.m. to 6:30 p.m. and is included with the Ultimate River Fun Wristband.
What rules apply to containers and coolers on the San Marcos River?
Our stretch of the San Marcos sits outside the New Braunfels city limits, so the strict Comal "Can Ban" does not apply. Standard cans, plastic bottles, and reusable containers are welcome, normal-sized coolers are fine, and there is no 30-quart cap. Glass is the one hard no — for everyone's safety. Please help us keep the river clean: pack out everything you bring in, and grab a complimentary river trash bag at check-in so you can collect any litter from your float.
Are aluminum cans and plastic bottles allowed on the San Marcos River?
Yes. Aluminum cans and plastic bottles are both allowed on the San Marcos at Son's Blue River Camp — the only banned container type is glass. We do ask every floater to please pick up their trash and not litter. Free river trash bags are available at the river beach so empties and wrappers can ride back down with you instead of ending up in the water.
How do river flow levels affect whether the San Marcos is open or safe?
The San Marcos is spring-fed by the Edwards Aquifer and stays strong and steady year-round, even in drought years. Flows under 100 cfs feel slow and family-friendly, 100–250 cfs is the ideal float, and above 300 cfs the river runs noticeably faster — we adjust operations and life-jacket guidance accordingly when that happens.
Do I need a life jacket on the San Marcos River, and is it safe for kids?
Our stretch has a gentle current and no tube chutes or dams, which makes it well suited to families and first-time floaters. Life jackets are not required for adults but are strongly recommended for young kids and weak swimmers, and complimentary jackets are available at the river beach.
Which outfitters offer rentals and shuttles on the San Marcos River?
Son's Blue River Camp and Son's River Ranch are the on-site outfitters for our private stretch in Kingsbury — tube rental, kayak rental, and unlimited shuttle between the two properties are all bundled into the Ultimate River Fun Wristband. Several public outfitters also operate on the upper San Marcos near downtown San Marcos and Martindale if you want to float a different section of the river.
Plan Your San Marcos Float
Reserve a private cabana for the day, or stay overnight in a riverfront cabin or glamping tent.