Minecraft wiki entry for Building_a_metropolis, associated text: Races This would be an arena that is long and has seating on the sides (they could be going up like a slope) dig a 1+ block deep canal in the middle and have it at least 5 to 6 blocks wide. Fill it with water source blocks. Put some turns and obstacles in it and you can have boat races! Or, instead of using water, keep it dry and race on pigs or on foot, with speed potions in the latter case.