Thanks a lot! I'll just delete the park addresses completely then since it seems they aren't needed afterall.

I meant where/how on this: https://blog.openstreetmap.org/wp-content/uploads/2013/08/id-editor-sotm-us-2013-venue-screenshot.png
I just use the standard template form and don't see any drop downs that say "is_in". Or do you mean that's what I should type in the box where the house number would be if it had one? ((Also if you have a screenshot showing what you mean that'd be really helpful since I'm more of a visual person))

Someone told me to use Key:is_in before but not how/where to do so. So I'm totally willing but clueless!

Whoops, sorry, noted. Since the address option was there I thought it needed to be added to all.
I don't understand the part about using key is_in though.