Really wanting to do this excursion. I have a 3 and 5 year old and am wondering if my three year old can go... the excursion details says no minimum age and then it says must be 3 feet tall. My son is a little over 3 feet. when i go to book the cruise online it wont let me purchase for him, however the excursion details doesnt say infants free like others do. has anyone been on this with young kids? if so did they enjoy it. also this excursion is a little pricey so is it worth it?