We did Universal Studios last year before our cruise and had a blast. However, the lines were long (some as much as 45 min to an hour) and depending on what time they get off the ship they may not have time to do much while they are there. Also, do they have a plan for their luggage? Last year when we flew out of Orlando we tried to check our luggage early so we could do something other than hang out at the airport and they wouldn't let us. Luckily our flight was earlier than 8 p.m.. They may want to try SeaWorld. I found you could do and see more in a shorter time frame.