New Braunfels is great if you want to do the lazy river/intertube fun. Fredricksburg has all of the tourist dives but also the WWII Pacific/Nimitz museum. Also a lot of good scenic drives in the area. San Antonio has the Riverwalk which is pretty neat along with seeing the Alamo. Waco has Magnolia (Gaines fame) if that is your thing. For eating stick to the 3 texas food groups. BBQ, Tex Mex, and Steak. Salt Lick for Austin is good suggestion. Lockharts BBQ is also good.