We bought a Thousand Trails membership a couple months ago specifically because we wanted to camp along the Oregon and Washington coasts and because there are almost no boon-docking locations here.
I recommend calling them on the phone instead of buying a membership online because we basically got all of California for free when we called and just asked for the Oregon coast.
I know some folks pay thousands of dollars for the elite membership and a couple of the other levels, but we only paid $500 for a one year membership with certain restrictions, which so far, haven't been a big deal for us. We can spend 14 days at one location then we have to be out of their system for 7, rinse and repeat. OR, we can just stay for 4 days at each location, and go from one TT location to the next, as often as we like. We started off by spending 11 days straight at the TT in Bend Oregon which basically paid for the membership right there since that location without a TT membership is like $47 a night. That being said, every place we stay now, for the rest of the year, is basically free. We don't pay any fees at all, we just go to their website and book the days we want to stay.
Unfortunately, all the TT we've been to seem run down. They all look like they were probably pretty nice 20 years ago. A couple that we stayed at had descent enough showers and bathrooms but every single one that had a laundry room would have half of the machines with "out of order" signs on them.
So far we've stayed at the Oregon TT campgrounds in Bend, South Jetty, Pacific City, and Seaside. In Washington, we stayed at Oceana and Long Beach, which was my favorite so far. At most of their "parks" you're crammed in like sardines. Most of these parks had an overflow area that we opted to stay in since we generate our own power with solar and we'd rather be in a field 100' away from everyone else, but we still get to use their WiFi, and laundry facilities. Nearly all of the TT locations we've stayed at are walking distance to the beach. Overall, the membership is WELL worth it for us, but we full-time. The main reason we're hanging out here is because the temps for the past 5 or 6 weeks have stayed between 50 and 70 all up and down the Oregon and Washington coast while the rest of the country seems to be experiencing some good old global warming. When the temps East of here start dropping below 80, I'm guessing in September'ish, we'll leave the coast, and head South East.
We'd eventually like to do some boon-docking in Nevada and Utah, way WAY OUT away from everyone else.