Minecraft wiki entry for Building_a_metropolis, associated text: Swimming Pool and Spa: Where players of all ages can go to have a good time. For the pool, remember to have a shallow end (players can touch the ground without going underwater), a drop-off (where the water gets deeper), and a deep end (not for the faint of heart or poor swimmers). For a hot tub, remember to have a seat along the edge and water with no current. This is where players can go to relax. For a more realistic hot tub, place soul sand at the bottom of or under the floor of the pool, so it creates bubble columns in the water.