With 6 in your group, I would definitely be looking at flying into STT and taking a water taxi over to Sea Tiger. Like MIDiver said, call Island Time - we took them in April. Part of our group was delayed 2 hours - taxi and boat driver were monitoring the flights and talking with me while we hung out at the bar in the airport (I was the early/on time guy). When the rest of the group arrived, taxi was waiting, got to Red Hook, boat was waiting (with our BVI Customs forms pretty much all filled out), fast ride across to Road Town (we were late after all), and dropped off at the boat. They could not have made the trip over any easier or more convenient.

Another option to consider. Enjoy Sea Tiger!

Keep Smiling!!!