I have been going to the Oregon coast since 1949 and still find places to see and things to do that were there before my first trip. In plain English, there is never enough time.
I'm going to make a guess that you folks are more journey oriented than destination oriented, I can understand that and it has been our mantra for forty years. That being said, a couple of highlights you might want to look into would be, near Coos Bay is a small Marine Science Center, I can't remember the name but it is second to Hatfield's and the Newport Aquarium.
Winchester Bay is a small village with a huge recreation area and great fishing, the Winchester Bay Marina and RV Resort is really nice and inexpensive. It is part of the Douglas County Park System. Follow the quads and OHVs out to the dunes, turn right leaving the campground and just follow the road to the end. Lots of short hikes and lots of dunes, this is a really big area and every bit as nice as Dune City or the Florence area dunes.
McKinny's RV Park in Waldport is FHU and nice but the big draw is if you like or want to try dungeness crab, there is a public fishing pier in town and a couple of places to rent crab traps and bait at the head of the pier. Same places will cook your crab and clean it too. No they will not crack and pick it for you.
South Beach, Beverly Beach and a dozen other state parks have great sites, a lot of them are just sites, no hook ups. Newport is just up a few miles and Old Town, Rogue Brewery, Hatfield's and the Aquarium are within 30 minutes, The Rogue Public House in old town has great hamburgers and homemade crisps(potato chips), as my then 7 or 8 year old DGS said, "Best Pub Hamburgers I've ever had".
Lincoln City has a lot of activities including, a blow your own glass fishing float studio.
We haven't camped much above Lincoln City but the Tillamook Creamery is another nice lunch stop and the ice cream is outrageously wonderful.
At the Columbia River, we happen to like Cape Disappointment and the campground there, it is in Washington and has a lot of Corps of Discovery and seafaring stuff there.
Back on the Oregon side you'll find Ft. Stevens is a 3400 acres park and has the largest park W/O the Mississippi or maybe the entire Country. Fort Clapsop, a reproduction of the CoD winter over site and The Columbia River Maritime Academy. The river road from the museum is a lousy road to drive over to Portland, curvy, narrow and lots of ups and downs and towns, I would hit the OR side of the river and then the WA side and take the WA highway back to five or 205 and into Portland.
There are books on the Oregon Coast Lighthouses and if that interests you, there is another two week trip.
What I have outlined is for this and your next two or three trips. It is almost impossible to visit the OR Coast and not want to go back. We just sort of consider it our back yard and we go there to play. So go see what you can and hopefully you'll get to come back and see more.
We've driven one MH to all 49 continental states and we are now doing it again with the Adventurer, but, now we have a bucket list of almost every state and as retirees, we can go for weeks on end and just visit specific geographic areas. N/B, S/B, it doesn't matter.
"I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to go". R. L. Stevenson
David Bishop
2002 Winnebago Adventurer 32V
2009 GMC Canyon
Roadmaster 5000
BrakeBuddy Classic II