Hiking at Pedernales Falls State park would be a great outdoor activity. There are hiking trails of various distances for all levels.
You can experience a piece of Texas and U.S. history by doing a self-guided tour of LBJ's ranch.
Cute little lunch spot with good sandwiches and salads and a cute patio.
Real Ale has several good beers and you can do a brewery tour.
Salt Lick has great BBQ and it's BYOB. We're going to have BBQ catered at our wedding so you may not want to fill up on BBQ before!
Wimberley is a really cute artsy town on a creek with some nice shops and restaurants. It's a little taste of Texas hill country.