A whole bunch of folks on this forum are Escapees members. Go to the Escapees web site to find information about the club and parks. Escapees have two types of parks - co-op parks where you buy a membership. The different co-op parks have varying rules about non-co-op members staying in the parks, and there are always stay limits for that. The other type of parks, called Rainbow Parks, are "come and go" parks that aren't co-ops. You would have to check on the individual Rainbow park pages to see what their stay limits are. I'm not sure that Escapees is what you're looking for from what you've described, but for accurate information, do your reading on their web site.
Rob