We went to blizzard beach in August, we were staying at SSR. Got there at 8:30 the park opened at 9, we left at 1:30, 2. We were the second car in the park, when we left the parking lot had been closed for at least 2 hours, as a rule of thumb it is least crowded during the middle of the week, but depending on the time of year that changes too. But the best day I can say to go to them would be the hottest one. :animwink: