I have the walk through walls app thing installed on my 3ds, tell me any supposedly unfinished places and I will walk to the unfinished spot in question and report back with pics. Duplicates will be ignored, shitposts as well.

Pic related, the golf course is empty except for a single fissure-like hole (the one you can see on the map) something interesting to note though, is that there are two palm trees at the place on the map where there is a large circle, and a floating triangle, the space between the palm trees also have collision detection (possible captains gate?)