On Pool Island, you have pools, a building with lots of pools and items, and even a canyon that can be used as good sniping spots. Good for instagib and free-for-all, since it's a small map.
not the best map ever made.. the layout seems rather random and the outside pool is waaay too deep. also the items are randomly placed.. you built a massive fountain for just one rocket pack.. it looks very rudiculous. also, i hATE tunnels in the water.. it adds nothing to gameplay.