re: Have you ever been to Gruene Hall in Texas?

It's fantastic as is Whitewater Amphitheatre. It's further up river outside of the city limits. You can either get a ticket for a show or sit in your tube on the river and listen out there.

Also if you tube the river up closer to Canyon Lake, there are no restrictions on the amount you can carry in a cooler on the river - there is in New Braunfels city limits. The water released from the lake is from the bottom of the lake and good and cold - great for the hot summer months. Just a friendly tip from 'ol CC