I recently updated my map that I created for planning amusement park roadtrips. It has every park in the USA, Canada, and Mexico listed on the RCDB as operating and having at least one existing roller coaster. Each marker has a link to its RCDB page for reference. I figured I'd share it with you all in case you want to plan roadtrips too, or just to see what parks are near you that you may not have heard of or considered before.
https://mapsengine.google.com/map/viewer?mid=ziN7v3aIYunY.kC9092YWiE6k
Sorry if it is hindering efficiency or clarity using green markers for parks that I have personally been to. Let me know of any additions or mistakes that need fixing, or if you think I should change the green markers if you're truly going to use it enough to make that worth my while. My next project is some form of international map...that will be a while. Hope y'all enjoy!