If you enjoy getting away from the crowds and camping more primitively, this place is for you. Facilities at the campground include vault toilets and trash cans, but no running water, so bring your own. There is a boat dock and a few sites even have direct lake access. Some of the best rainbow trout fishing can be had here, there are some big ones lurking deep. Unfortunately since this is a reservoir, swimming isn't allowed, but human powered boats (canoe, kayak, SUP) are allowed.

If hiking is your thing, not only is there a relatively easy trail, i.e. good for families, that goes around the entire outline of the lake, but the PCT (Pacific Crest Trail) is nearby, with some great views and small lakes (that you can swim in) along the way. Oddly in camp the mosquitos weren't bad, but on this section of the PCT I got eaten alive, so bring plenty of protection during mosquito season.

Before you get to the campground you'll see the the Olallie Lake "resort" with some primitive cabins and a yurt to rent. The resort has a small store (be sure to support them with a purchase) with pedal boats, rowboats and canoes that can be rented here.

There's plenty to do at Olallie Lake, so bring your fishing pole, your swim suit and your hiking boots and enjoy the amazing secluded views of Mt Jefferson and Ollalie Butte, and the solitude.