I arrived mid-day in the middle of the week mid-September. There were lots and lots of campsites to choose from. The campground has several loops and is the bigger of the two campground in the park. Mazama is the only RV campground at Crater Lake. There are trails right near the campground and you can walk to Annie's cafe, a small and sparse general store, and a gift shop. Water and flush toilets are available. When I was there it was very chilly all day but especially at night.