Fun and inexpensive way to enjoy and relax your day. It's become my favorite thing to do in Arizona beside the water park. For $15 you can rent a tube and free bus ride for pretty much the whole day.
River shoes is a must! Old tennis shoes work too trust me you'll thank me later.
Bring sun screen on the tube with you and keep applying as you go, not just at the beginning.
Bring a towel or a T shirt to wrap around the black tube because it will get really hot.
Bring booze and beers and a cooler! Have fun!