K.B.
I'm always for going to New Braunfels!
If you get bored with Schlitterbahn or tubing you can always take a day to go visit San Antonio (about 30 min. S. of New Braunfels) or Austin (about 45 min. from New Braunfels) or go to Fredricksburg (about 1 hour).
http://www.gruenemarketdays.com/ (Cute little town on the border of New Braunfels) They have great hotels & B&B places & you're a small walk from the river.
http://www.hill-country-visitor.com/ (site helps with getting to know the Hill Country area)
This is just a small portion of sites but gives you an idea of the area.