Inge -
What makes the Willapa Bay region fascinating is that it is an immense tidal lowland - rare on the Pacific Coast.
Public campgrounds from Westport south to Astoria:
1. Twin Harbors SP - hiker/biker sites, easy access to Westport
2. Grayland Beach SP - no h/b sites, reservation suggested
3. Bruceport County Park - 5 miles SW of South Bend
4. Bush Pioneer Park - Chinook tribal park, end-of-the-world location on Willapa Bay
5. Cape Disappointment SP - h/b sites, spectacular cliffs, tiny cove for swimming
http://parks.state.wa.us/843/Pacific-Coast-Regionhttp://willapaharbor.org/what-to-do/regional-attractions/parks/There is a private campground in Raymond like an RV parking lot.
There are meh private campgrounds around Long Beach, but you are so near Cape Disappointment.
If you are willing to swim a small channel or hitch a ride, there are wildlife refuge camp sites on Long Island.
https://www.fws.gov/refuge/willapa/visitor_activities/camping.htmlIt's about 42 miles from Twin Harbors SP to Bruceport -
but just 50 easy miles to Bush Pioneer Park.
Then it's 44 miles from Bruceport or 36 from Bush to Cape Disappointment.
My suggestions would be Twin Harbors/Bush Pioneer/Cape Disappointment.
You could easily loop back into Westport and hit a grocery/cafe - then ride the dune paved trail.
Bay Center is a Chinook community, but the Chinook people are no recognized by the fed govt as a tribe.
(Even though they were the major people and their language was the lingua franca of the Pac NW for a century or more.)
Make sure to visit the Lewis & Clark Center at Cape Disappointment - then go for a swim in Deadman's Cove.
https://ridewithgps.com/routes/25944871Have a great trip! - J
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Pic - Willapa Bay at North Cove