What a beautiful place! The campground is in 500+ acre Tolt-McDonald Park, far enough away from any busy road so that there is no traffic noise, just the sound of the Tolt River rapids. All the RV sites are drive-through, with water and 20, 30, and 50-Amp service. (There is a privately-run RV dump on the way to the park.) The sites are wide because of the driveway. No trees between sites, but some bushes between sites offer some privacy for the back half of the sites. The 17 RV sites are around a huge lawn, with the restroom building at one end, and a path down the middle that is part of a long, level, paved bike/walking trail. There is a shower in each restroom, so the whole building is heated (which was really nice, since the lows were in the 30s in April, 2022) Access to both rivers is at the South end of the RV loop. There are tent-only sites to the North, and also yurts and more tent sites across a picturesque foot bridge over the Snoqualmie River. There are carts available to roll your stuff over the footbridge.

We stayed in August after making reservations in February.  Highs were in the 80s, but our site stayed shady all day with just dappled sunlight.  Lows in the low 50s.
Sites vary in length and width, besides the driveway, and some are even split-level due to the terrain.  Separation between sites varies, too - sometimes ferns and many big trees between sites, sometimes just one tree at the back of the site.
No water or power hookups, or sewage dump, but complete restrooms (although the showers were closed due to COVID-19).
Easy beach access, and the Detroit Lake water was warm.
Very quiet at night, besides some noisy campers, because Highway 22 is on the other side of the lake.
Boat launch has a restroom and huge parking lot.

Cresap Bay is a campground on Lake Merwin on Pacificorp land near Amboy, WA.
Full of tall trees and ferns, with large-ish sites that are separated by trees and shrubs.
Very clean, nice attentive staff.
Swimming area with beach.
It caters primary to boaters and watercraft users with a nice boat ramp, but also has a free moorage dock.
There were very few insects when we were there at the end of June, and lots of birds to see and hear.
There is an area just for tents.
No hookups, and a 7-day limit, as the place is VERY popular.