Since I hear this question fairly often I thought that I would mention it again. You do not need a reservation to visit Disney’s Blizzard Beach Water Park. All that you need is your ticket. Capacity is limited, but I haven’t heard of the park hitting capacity since it reopened. When I was there recently it was pretty quiet, even though it was a very hot day. Still, if you plan to go, you may want to arrive early, just to be on the safe side. With only one of the two water parks open, capacity will most likely be reached often during the busy summer months.