First of all, as for all the fine detaild of Maxpass, I don't think anyone really knows yet. But here's my guess. I don't think of the GCH as being "in" the park so much as right next to it. I don't think it will count unless they decide to give GCH guests a special perk. However, depending on what method they use to determine whether someone is physically in the park, some of the rooms might be close enough to trick the system. You would still most likely have to enter the park first to activate your pass for the day, but it's possible some people may be able to return to their rooms and still access the FP system. We'll have to wait and see.