The trip over to St John is really nice with plenty to see but unless you have a super long day in St Thomas most of your day will be spent doing the ferry rides and taxis. We actually only had about 2 hrs at Trunk Bay and part of that was spent Listening to orentation and getting fins. There is a Cat called "Castaway Girl" in St Thomas that we have done several times for snorkeling and highly recommend. It is a ships excursion with pickup right at the dock.
50 Carnival: Mardi Gras, Ecstasy X2, Fascination X6, Celebration, Elation X5, Glory X4, Fantasy X4, Valor, Holiday X3, Imagination, Liberty, Spirit X2, Freedom, Destiny X2, Splendor X2, Dream X2, Conquest, Legend X2, Victory, Sensation, Paradise, Inspiration, Magic X2, Triumph, Miracle, Breeze
5 Norwegian: Sky, Jewel, Dawn, Epic, Pearl
6 Windjammer: S/V Legacy X3, S/V Polynesia, S/V Caledonia, S/V Diamant