Rialto Beach is ranked number one attraction in all of Olympic Peninsula by Tripadvisor reviewers. The beach is full of interesting rock formations, arches, tide pools, drift woods. Great for hiking and camping as well.
Forks is the home to Twilight series. It was formerly a struggling logging community recently transformed into a major tourist town as it is now visited by fans all over the world. Go visit Forks Timber Museum and the town has quite a few artist's studio and galleries. I guess you can also visit various Twilight movie's scenes of shooting :-)
Pacific Beach is home to Pacific Beach Inn and perfect as the base for day excursions to north and south coast. Nowhere will you find a better combination of natural beauty and modern conveniences. Pacific Beach, by the way, was rated 3rd most popular beach in a statewide poll.
Ocean Shores is the major tourist town on the Washington coast. It has every amenities including a movie theatre and an 18 hole golf course. Ocean Shores itself is a six-mile-long peninsula bordered by the Pacific Ocean and Grays Harbor, and the six miles of sandy beaches make the ocean its primary attraction. There are two fresh-water lakes, 23 miles of canals and an old-growth rain forest in the middle of the city
Hoh Rain forest is one of the finest remaining examples of temperate rainforest in the US and is one of the Olympic Peninsula's most popular destinations. The hiking is second to none with greenery you won't see anywhere else.
Sol Duc Valley offers a pleasing mix of towering old-growth forest, snow-capped peaks and glittering lakes. Sol Duc Spring is an area with hot springs formerly known for their therapeutic value. Sol Duc Falls is one of the crown jewels of Olympic National Park. Sol Duc River is the primary route taken by coho salmon on their way to spawn and is popular with anglers.