Just went to Busch Gardens Williamsburg and Water Country USA last month, and was surprised to learn that you could use the refillable drink cups from one park in the other, and in fact, could use old cups from the previous year and the one from BG Tampa that we got last year! It was clearly listed on the signage... However, this year's cups were barcoded and refilled for I think 99 cents, where the older cups cost more, I think $1.29? Anyone know if those cups could also be used at Sea World and Aquatica? I need to know whether to pack them...