The boat house is awesome. A little difficult to place, though. Or is there a trick to it? I'd like to build a pier first, then snap the plot to it's end.
And lol. That's Spectacle Island, isn't it? I think I have one of these at the exact same location :D
Also, if you have started adding aquatic plots now, how about aquatic farms? Like, a fishing cutter, a fish/lobster/oyster farm, or tarberries/bloodflowers.
There is also that barge model in the game, I think you could make a nice house out of one of these, too :D
... if that stuff happens, someone should add a settlement in the middle of the ocean. Build your own Libertalia!