Your lucky. I'm jealous! I don't know what you want to do there... If you just want to shop, then I suggest going later when there aren't lines for the shop, if you just want to get on the rides, again, go later. If you want to get into Ollivanders... Errr, go two months ago xD... But seriously, if you want to do everything, just go now and decide what you want to do most when you get there and get right in line for it...