My sister has invited us to share their (her and her husband's... no kids) timeshare in Orlando from Dec. 24-31. She really wants to go to US/IOA but I'm not sure it will be worth it for us. Our kids will be 9 and 6 (almost 7). I'm guessing the 9yo will be around 50" at that time and the 6yo probably 46". They are both daredevils and love roller coasters, but I'm guessing they'll be too short for most. If we had to pick one park which one should we pick... US or IOA? Would they enjoy the Citiwalk area? Are we crazy to even consider that week knowing it will be packed?