I have just the thing for you. With a chattymap collection, you can tell stories about all those wonderful places and share them with the world:
There isn't enough content to showcase on the map right now but I'll work on that. Give it another go in a couple of weeks or so.
As it stands I think you will have a hard time getting people to start filling your database.
I'm quite into paddle boarding at the moment and in the UK there are a lot of good places to launch from that are not well known so that would be a good niche to start with.