The two buildings closest to the Springs pool is 4101-4436 and 3501-3836.
The two buildings closest to the Grandstand pool is 8101-8436 and 8501-8836.
For the Springs section, Both of those buildings are equally fine. You will still have to cross the road to get to the pool. Building 4101-4436 is closer to the bus stop, but not by much.
For the Grandstand Section, The 8501-8836 is right in front of the pool, literally. This building is closest to the lobby and a short walk to the Springs pool.
We stayed in the building 8501-8836 during Memorial Day weekend and loved the location. The bus stop is just a short walk away and is the first stop in the resort. The boat luanch is also a very short walk, just go right instead of left to the lobby and its right there. Plus easiest building to go back and forth between the two pools and AP.