Beach Overview of Washingtons Beaches at the Pacific Coast from the north to the south:

Olympic National Park:

Rialto Beach - Rialto Beach is situated at the Pacific Coast of Washington within the Olympic Nationalpark. The beach consists of lots of pebble stones and washed up logs / tree trunks.  Rialto Beach can’t be used for a day at the beach.

Ruby Beach - At the southwestern edge of the Olympic Nationalpark there is the scenic Ruby Beach. Ruby Beach is situated close to the US Route 101 (also known as Highway 101).

Pacific Beach State Park:
The Pacific Beach State Park  is located at the city with the same name. The Pacific Beach State Park has a leveled white sandy beach. There is a campeground at the  Pacific Beach State Park.

Ocean City State Park:
The Ocean City State Park is situated west of the city of Aberdeen. The beach at the Ocean City State Park is leveled and sandy.

Grayland Beach State Park:
The leveled sandy beach of the Grayland Beach State Park is situated at the southwestern Pacific Coast of Washington. At the Grayland Beach State Park are restrooms and  a campground. There is no entrance fee (as at: September 2009).
Note: The pictures of the sand are slightly enhanced.

Informations at USAXL.com: Olympic Nationalpark - Seattle