You have to love Petit Jean; its namesake was a badass and it's one of the best destinations in the state. There are several viewpoints/vistas that you can access from roads (just two close together that involve some driving on gravel). Get a State Park brochure at the Visitor Center, because you should not skip any of these lookouts. There's also great hiking, waterfalls, "turtle rocks", caves, and a lake. As far as camping, on the lake side of the main road is an out-in-the-open loop for large RVs with full hookups. On the other side of the road are the shadier, friendlier loops (three loops) with partial-hookups (electric and water); campsites that are also nice for tent or hammock camping. The bathhouses are not new or state of the art, but they're fine and are cleaned regularly. The sinks have soap but not paper towels, so bring a bandana at least. Best recommendation for picking a site is to stay away from the roads - you don't want to listen to cars and trucks going by. B and C loops give convenient access to the bike path, which leads to: Visitor Center, swimming pool (call for summer hours), hiking trails, and finally Mather Lodge. Bring your bicycle so you can keep your car parked and still get around easily. Down and across the road you can get to a playground, as well as a boat house for canoe and paddle boat rentals. My family's favorite activity is riding our bikes from the campsite to the restaurant at the lodge for dinner (the lodge now serves a few cocktails and the Old Fashioned Bourbon is recommended). If you've read this far, I'll tell you the best bang-for-your-buck hike, my personal favorite: Bear Cave Trail - a few steps from your car you're walking among (or climbing upon, if you are brave) giants' rocks.