The pool is a very basic pool (one big rectangle), as it was simply refurbished from the original Treehouses resort. It is located down near the southern bus stop (there are 2 - north and south), near the boat dock, and near the walkway over to the Grandstand part of SSR. That walk, from the bus stop to the Grandstand is about 5 minutes. To get over to the Carriage House and the feature pool/Artist's Palette area is about 10 mins at a leisurely pace, a little less if you walk faster, but with kids in tow I'm guessing not.
The north bus stop is up closer to the road entrance/exit from the THV's, and from that bus stop to the south stop is about a 3-5 min walk. So if you were at the furthest units to the north, figure about a 5-7 min walk to the south stop, and then on from there to the main parts of SSR.