Olympic NP is huge and is surrounded by US-101 on its W, N, & E sides. On the east side we have stayed at Lake Cushman with hookups. It is run by one of the Tribes. On the north anywhere in the Sequim, Port Angeles, Lake Crescent area is good so you can explore that area of the NP. Lots to do and see...very scenic. We like Salt Creek Campground (Clallam Co. Parks) at Joyce just west of Port Angeles. Hookups with a sewer dump station on the way out. On the west side google the Forks/LaPush for Campgrounds. Kalaloch campground is right on the coast, run by NP, and very popular.