We stayed in unit 7037 and it was perfect. Right across from the pool, a very short walk to the boat, and probably most important was that it was close to the path to the Grandstand. We also had a nice view of the golf course. We skipped the THV buses and would grab it at the Grandstand instead of transferring. It was the first pickup so we always got seats and also the first drop off. This was a big time saver.
I woudn't want to be along the water right at the boat dock. They sound their whistles every time they dock and they are pretty loud. This goes on all day long.
I would just make a general request to be in the south end, close to the Grandstand walkway.
We loved the Treehouses and can't wait to go back there.