Also, get a tube with a bottom if possible.
River Sports Tubes - along the Guadalupe River, a popular tubing location.
Rockin' R River - they also offer rafting and camping.
Gruene River Company - Rent a tube or raft on the Guadalupe River.
Take a Segway Tour
Take a segway tour of Austin.
Seg City - Segway rentals and sales
Take a Trolley Ride
Take a tour of Austin in an air conditioned, restored, wood and brass trolley or shuttle bus.
Austin Trolley Company
Rent a Bicycle
Go for a ride around Austin.
Barton Springs Bike Rental - bike rentals and tours
Ride a Hot Air Balloon
Get a view of central Texas from up high.
Austin Hot Air Balloons
Take a Boat Cruise
Capital Cruises - Take a lunch, dinner, afternoon, or bat watching cruise on Lady Bird Lake.
Lake Austin Riverboats - Charter a riverboat for your special event.
Take a Duck Tour
Duck tours are popular in many cities. Take a fun, informative tour on the streets of town and then finish with a cruise on the lake in a specially designed, US Coast Guard inspected amphibious vehicle.
Austin Duck Adventures
Ride a Steam Train
Take a steam train tour through the Texas Hill Country. Travel to a neighboring town, have lunch and do some shopping, then return in the afternoon. Special holiday and Christmas rides are also available (advance reservations required).
Austin Steam Train
There are two public caverns in the Austin area.
Natural Bridge Caverns, in New Braunfels about 1 1/2 hours drive south of Austin, offers several different tours of the cavern system and also climbing, ziplining, and panning for precious stones.
Natural Bridge Caverns
Inner Space Cavern is in Georgetown, north of Austin, and provides a tour of the caverns that gives visitors a glimpse of the past geology and wildlife of Texas.
Inner Space Cavern
Go Horseback Riding
Take riding lessons or board your horse.
Paul Cates Stables
Take a Zipline Tour
Just 30 miles from Austin, take a guided zipline tour of the Texas landscape from the treetop canopy. For adults and kids 10 years of age and older.
Cypress Valley Canopy Tours
Go Parasailing on Lake Travis
Just west of Austin, take a supervised, guided parasailing ride over the lake.
Indoor Go Kart Racing
Just northeast of Austin, get a taste of Formula One racing with K1 Go Kart racing.