On your trip to the Olympic national forest make sure you spend a few days at the beach. We choose Mora because it's proximity to Rialto Beach. The campground is lovely and they host some evening events at the amphitheater. Rialto Beach is lovely though you may end up parking in the travel lot on high traffic days. Walk the mile and a half down beach to get to hole in the wall and experience beautiful tide pooling. You can also get to 2nd beach on the reservation. It's more of a hike to and from but the view is unforgettable and the beach is much more sandy than Rialto.
This is our all time favorite stop in the Olympic national forest. Lake crescent is gorgeous and crystal clear through and through. On a hot day enjoy a day on the lake. Jump in from the boat dock or swim in the swimming area. Rent a canoe or kayak from the general store just up the steps from the lake and have a fun few hours around the lake. The store sells firewood and drinks and some interesting literature about the lake. Drive the road past the campground to a trailhead for the railroad bridge trail. It's a few miles from this side of the lake so make sure you pack a lunch and lots of water. Spend the day jumping in from the bridge at the end of the trail.
A must do for Olympic national park. Cold at night because of elevation and be sure to have a rain fly, but you're surrounded by magnificent old growth trees. Head up to the lookout and take a short walk about to see marvelous view of the north cascades and Victoria on a clear day.