Agree - for a large group to Rick's you definitely want a van and a driver who will wait for you. Contact a few people from the transportation link on this thread and give them your specifics and see which response best suits you. We use Kingsley James of Takecare Tours and I know there are other good ones (everyone seems to have their favorite!) Also, think about where on 7 mile beach you want to go - since that is a much shorter trip, I wouldn't worry about a taxi as you can easily split into two groups and stay together.