Here is a 7 day Group cruise that I Booked last year for the "Rivera Family". The group of 25 flew from Philadelphia and New York to San Juan, Puerto Rico. They wrote and called me to say that it was an incredible vacation.
This was their itinerary: 7 Day Southern Caribbean from San Juan, Puerto Rico: Depart:: San Juan, Puerto Rico Aboard the: Carnival Victory Ports of Call: St. Thomas, USVI, Barbados St. Lucia, WI St Kitts, WI St. Maarten.
Here's a plug for using a great travel agent for your group travel booking. They make it much easier to find the best deals, and special needs just for your group. I'll post photos once they've forwarded them to me.