Hi Everyone! We are taking our first Disney Cruise during May of 2014, and we were looking into the Atlantis Aquarium tour as an excursion for our family. Our children will be 4 and 8 at the time of sailing. I figured the walking would be OK for our oldest, but do you all think the 4 year old would be OK? And for those of you who have done the excursion, how long did you spend there? Thanks for your help.