We are going to spend the day at Islands of Adventure and then go to HHN that night (it will be a Sunday). I want to pre-purchase Stay and Scream for our trip but will it be useful even though I'm in a different park? In other words, will we have to stand in line outside the studios even after we have purchased Stay and Scream, or is there an area for S&S at IOA which connects you with HHN at the studios? I'm a bit confused. Thanks.