First time Disney cruiser here and can't express how excited my family is for our upcoming Eastern Caribbean cruise. After reviewing the website there are 30+ excursions for St Thomas and Tortola. What are some of the favorites for a family of 4? Ages are late teen, mid 20s, and 50ish parents. What can you do in the ports if you do not book an excursion or is it most advisable to book excursions? I was told to login at midnight when it opens up to book as popular excursions and ship reservations can fill up. Also, if there is a place on this board that already has ports of call info/recommendations please point me in that direction so I can investigate what my family might be most interested in doing in order to take advantage of early booking. I'd also love any feedback on Castaway Cay as well. Thanks !