If you come to New Braunfels, consider Natural Bridge caverns and Bracken cave. Natural bridge is beautiful, cool, and moist. Only cave I've been to that has an airlock to keep the moisture inside. Moisture keeps the cave alive. Bracken, which is next to natural bridge, is the largest bar colony in the world. Bats are only here in summer. You have to join Bat Conservation international, then make a reservation. Comal river is good too. Float Inn is right by the tube chute. For a small fee you get umbrellas, lounge chairs. They have parking, food, drinks. If the kids haven't seen the aAlamo or river walk, its 45 min away.