Mount Rainier & Olympic NP's- August

I might suggest taking 101 from Olympia toward
Port Angeles and follow it counterclockwise around
the NP. Then follow 101 all the way down to Astoria.
Don’t miss Cape Disappointment State Park before
crossing the river into Oregon. If you like fish and chips
a must do is a stop at the Bowpicker across the street
from the Maritime Museum in Astoria. Just look for the boat and
the line of people.
As someone else mentioned, Cannon Beach and also
Ecola State Park is one of the most scenic areas on
The Oregon coast. About 15 miles south of Astoria on
101.
As for camping around Olympic NP it might be Hard to
find a spot inside the park at this point. They fill up fast.
I would suggest Trying Fort Worden State Park in Port
Townsend . The town is worth a visit regardless.
Sequim State Park is another option or the Salt Creek
Recreation Area has a very nice campground.
You could spend a few days in this area exploring the north
side. Hurricane Ridge is a must see area.
Then head around to Forks. They have a few private
RV Parks. From there you can explore the west
side. Cape Flattery, La Push, the Hoh Rain Forest.
Then just continue on down 101 to Oregon.