Visiting Texas this June! Could use some more suggestions

Hi all! We are planning a trip to Texas in June this year. And with we i mean me (m) and my 3 (m)friends, ~35 years and from the Netherlands. And I'm looking for some extra help with activities or places to stay!

Since we'll be staying around 10-11 days i had the following route in mind, by car: Houston (flying) 2 nights - San Antonio 3 nights - Banderas/Fredericksburg/New Braunfels 1 night - Austin 2 nights - Dallas/FW 2 nights - Houston 1 night

However this feels like a lot of days in big cities and less in the country side besides 1 night in Banderas/Fredericksburg/New. Anybody had some suggestions on where else we could go to?

And for activities i looked up NASA/Texans BBQ/rodeo/Riverside walk/stockyards/Tubing?/Natural Bridge Cavern. And maybe an Astros or Mavericks game.

Any more suggestions that's worth going (or not worth going)? Or some thrill seeking experience like racing/shooting/hiking trips/indoor things?

Thanks all!