Great Basin National Park has a kids program almost every day at 1:30 (and sometimes on weekends at 9:30), so we decided to go check one out. It was Make Your Own Cave day, and the kids each got to select a box and get some clay to make their cave.
To find out about the kids programs and other programs offered, check the park website section of ranger programs. If you click the link under Evening Campground Programs, you can find the schedule for the week. Or you can call the park at 775-234-7331.