Will be in STT for one day on a cruise. Cannot believe we are doing this...I was always anti-cruise. Have been to St. John (spent 10 days there a while back) and have been to the BVI--Norman Island, Jost, and Virgin Gorda. What would be something great to do? Will have a 10 year old in tow. Not into real touristy stuff. Is Magen's Bay cool? Suggestions are welcome.