We are going for 1 day at the end of February and have decided to see Universal since we went to Disney in Dec. and are going next Dec. I originally thought that Islands of Adventure looked to have the most available for a 2 & 4yr old, but then we watched the tape and it looks like Universal may as well. I also have a 9&7 yr old and they are open to either. One is a daredevil and the other can go either way depending on the ride. For instance, he loves all the MTn. at MK but not Rock n Roller coaster or ToT. Thank you for any input!!