If in the states, I can recommend Emerald Coast Sailing in Pensacola for a couple that wants to learn. Not sure where your friends are from but if they are close to Pensacola we found it to be a great place to learn together.

Obviously not as nice as the BVI but I was all about the instruction and learning during my courses, not the location. My wife and I felt more confident getting in multiple repetitions being the only two students with one instructor, and they gave us more then the required time for the courses to get more time on the water.