You will be close to New Braunfels so definitely get down to old town. A visit to Gruene Hall is a must if you want a taste of a true Texas music venue. It's older than hell but probably the birthplace of the Texas outlaw country scene. Have no idea who is playing this weekend but go anyway.
If downtown by the Alamo go get a drink at the Menger hotel bar. Teddy Roosevelt camped out there for several months and recruited his rough riders from the bar. Good history there
. Story is he got drunk end up one day and rode his horse into the lobby straight back to the bar. Shit I think I will have a drink right now in memory! Have fun