A couple of things to see in Austin is the Bartin springs pool for a cool swim. Mt Bonnell which is the hightest point in Austin, and Hamilton Pool Reserve
Austin considers itself the live music capital of the world, so seeing a show will be important. There's also the Blanton Museum (and others)and historic walking tours.
Austin, Texas is an exciting city to visit. The home of the world famous University of Texas provides outstanding restaurants, beautiful scenery, and a music lovers paradise.