Some suggested next steps. Get a good aerial survey done, with pictures. This will help in planning, in disputes, and later in figuring out what it looked like before that thing that just happened, happened. Also hire a geologist to do a survey (if they haven't already) and identify all the water flow. You may want to build a cistern to collect fresh water when it rains/snows.
An acquaintance of mine who has a place in the seattle/vancouver area also build a small gauge rail line from the dock to the center of the island where accomodations were. Mostly he's a train nut and that scratched that itch but its great for bringing stuff in before storm season sets in.
+1 on the local visitation. People will drive over there and walk around. In the US you need to put signs posting it as private property if you want to have a hope of charging people with trespass. If you set up a fire pit and a place for your friends to sit around an chat, that it exists will get out and you'll have other people "borrow" it when you aren't there.
Definitely a lot of fun though. I am very jealous :-)