Longhorn Cavern State Park Trail is a 1 mile heavily trafficked loop trail located near Burnet, Texas. The trail is good for all skill levels and primarily used for hiking, walking, and trail running.
Cavern tour is great walking experience with a wonderful history lesson that was an additional bonus.
Family friendly cavern tour. Took a backpack carrier for my 15 month old. She did great on the 1.5 mile tour.
Got lost... but, it was kinda fun!
(Not unsafe lost, a few miles of trail that was not clearly marked, keep looping back. We knew we would eventually pop out near the main parking, so no biggie)
If you are into caverns, this one is pretty standard. It has a few nice features. It takes 1.5 hours to tour the cavern, and tours tend to end around 4p.m. It's worth a view if you've never seen it. Not a workout.