Washington state Seattle area suggestions wanted

[alesis]

Hey everyone,
We leave this weekend for a 16 day trip from Michigan to Washington. Because of the loooong drive, we have 3 nights each near Olympic, Rainier and North Cascades National parks.
We’re a family w kids ages 7, 11 and 13 and love all things outdoors (hiking, scenic drives, adventure parks, etc) and typical touristy stuff.
Just wondering what y’all consider “must-do” while we’re out that way. Of course we’ll cisit each park and the ocean as well. Just looking for more suggestions. Thanks in advance!!

[mockturtle]

If the weather's good, you could park your rig at Anacortes and take a ferry around the San Juan Islands for a day trip. I don't think you'd regret it.

[romore]

Lake Pleasant RV Park is a very nice campground in Bothell, a suburb of Seattle, but good luck trying to get in without a reservation in high season. We also liked Thousand Trails near Anacortes. It is a short ferry ride from there to Port Townsend on the Olympic peninsula.