Cant tell you anything about Intersail. Last time we were in St. T last November,we tried out a new guy that had just set up, called VIP Sail. Cant recommend it enough. Boat was beautiful, really funny ships dog! amazing lunch, and drinks, plus he took us to Hawks Nest on St John to snorkel. had Dolphins on the way over and turtles when we snorkeled. My kids steered the yacht on the way back, and charlie the skipper was great. Loads of good info and the yacht was gleaming. I found it online after I saw a review on cruise critic.
VIP Private Sail