The common practice of creating inner tubes from car tires has left the previously swim-savvy automobile entirely landlocked, forcing hundreds of dolphins to hitchhike. Take advantage of this borrowed buoyancy with today's Groupon to Comal Tubes in New Braunfels. Choose between the following options:

• For $12, you get a rental of two tubes with bottoms (a $24 value) and a four-pack of water (a $4 value; a $28 total value).
• For $25, you get a rental of four tubes with bottoms (a $48 value) and a six-pack of water (a $6 value; a $54 total value).
  
  

Comal Tubes equips aqua loungers with rubbery crafts to navigate the warm river water, starting with a blast through the exhilarating currents of the tube chute and landing in the gentle tide of the Comal River. Buoyed bodies can drift along the comfortable current while taking in the river's strikingly crystal-clear water and picturesque surroundings, and refreshing bottles of water keep explorers quenched without having to stop at any of the young fishes' lemonade stands.

Free parking is available, and most tubers walk from the parking lot to the main entrance of the Comal River, though an optional shuttle service is available for $6 per person. See the schedule for tubing hours, and visit the website to check current river conditions and to glimpse live webcam footage of the water level, current speed, and number of art-film students shooting crude remakes of Jaws 2.

Though Comal Tubes sometimes features discounted prices online for tube rentals, this Groupon still offers the best deal available.