Simple, when you are checking in, just strike up a conversation with the cm, and ask if there a possibility for a savannah view upgrade? They may respond that there is no availability, or yes, you can upgrade for so much more money a night, or they may offer an upgrade for free. You have a better chance seeing you’re going during a slow time, in September. It really never hurts to ask. All they can do is say is no (or yes!).
All I know is the cm’s at the front desk have always been so friendly. Several times that we were there, I wasn’t as pleased with the room view that I received. So, just called down to the front desk, and then by the time I went back to there from our room, they had several different choices to pick from for a new room. Mind you, it’s not as easy during busy times, but they always try to accommodate.