We have been camping for a few years now at Sequoia and try to do an activity each time we are there. The Crystal Cave was my first experience inside a real cave, as well as for my girls ages 8 and 10. We all loved it! You need to purchase tickets ahead of time at the Lodgepole campground. When you go to the site of the cave, you have to walk down to get to the entrance. We loved the beautiful waterfall too near the entrance of the cave (great picture spot). The cave inside is cold so be sure to take a jacket. It's a small hike back up from the cave, but well worth it with the great scenery.