For Olympic National Park, I think my favorite places are Sol Duc Hot Springs, Dear Park (due East of Hurricane Ridge, great camping, but far less developed), and Lake Ozette where you have an easy 3 mile hike to the ocean, then 3 miles along the beach, then 3 miles (on a different trail) back to the lake. The beaches of Olympic National Park are unique in the lower 48 for some of the longest stretches of completely undeveloped coast line. You can go backpacking along the beaches and barely see another human for a day or two at a time.