Oooh! I like the third one the most. Don't know about you, but where the plaza, town hall and Re-Tail are located are super important to me. I like the fact that the town hall and plaza are close, cause I feel like they relate to each other in some way, idk. Also, the bottom half of your town is empty (but probably full of trees and rocks yikes) so you could put a lot of PWPs and extra character houses there if you like. The only thing I don't like about the map is where the Re-Tail is, it's kind of close to that pond and that would bother me a bit. I'm also used to the retail being in the bottom half of my town so I prefer it to always be at the bottom but that's my choice.
And there's a private beach!!
I like the second map as well, I would definitely choose that if the third map wasn't there. I just don't like the placing of Re-Tail.
Looking back at all three maps is kind of changing my choice lol... but I say go for the third one