Mt Rainier NP is excellent, I think we stayed at Shady Firs CG which is right outside the park. The park is a bit odd but the Aussie owners were very nice. They had poor WIFI you had to get near the office to use it. They had a picnic table set up for that purpose.
Mt St Helen's and Mt Baker are a of couple others.
Then there is the Cascades NP. We plan to go this summer.
The Olympics are good but it is one of those parks that you cannot drive thru. You have to drive along the perimeter and there are short roads into the park. It's a long way around the perimeter so we ended up staying in two different cg. One on the east side, Glynn Aire RV park which was nice and had a fishing dock on the Hood Canal where my son caught lots of fish. Very popular with him. And the other on the west side, the Forks 101 cg. I never heard of Forks but my wife was quite happy to be there. The cg was a swamp when we were there, just an open field.
There are all sorts of excellent state parks on the east side of the state from what I've heard. You can catch a Ferry to Victoria Canada from Port Angeles.
Very few beach type parks as you know them in Tampa. The water is cold all year round.
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