To the left, to the left, everything you own in the box to the left...
I've had both orientations, and while I think the museum being on the right is a tad more convenient (if you want to dump your purchases from the shops in the locker), I don't mind it being on the left.
EDIT: I also like the bench with the sea view being closer to the shops. I envision a tired shopper taking a break over there.
I was hoping for it to be on the left side, because I wanted the right side to be where the bench is. It reminds me of Pokemon Mystery Dungeon when Diglett sits beside Dugtrio by the pelliper post office. (sorry I couldn't find a picture)
Right. I knew I wanted it on the right since before I got the game so I made sure the map I chose had it. XD I have it on the left in my spare town and I hate it.