Kayaking in New Braunfels, Lake Austin, Canyon lake is great, your bottom stays dry. But, you should try tubing! Especially in the last few weeks of summer!
I walk dogs, because it is never boring. I hate running. I go swimming all the time. I love racing bicycle. I only feel safe in the bike parks. Check out "Veloway" in South Austin. There must be more parks, for bikes only, up North, but I don't know them.
Best exercise is dancing! Put your high heels on and dance for 10-15 minutes! You will get energized and full of endorphins!