I am getting married at the Hilton Rose Hall later this month... in lieu of a traditional rehearsal dinner, we are hosting a sunset cruise aboard a private catamaran for all guests from 5-7pm the night before our wedding. Boat holds up to 60 guests and per person price includes open bar, roundtrip shuttle service from the resort to dock and snorkeling gear if you want it. The cruise coordinator (Denise) has been very helpful and friendly... she even offered to provide appetizers for a small extra fee, as we wanted to offer some food to our guests (we will have dinner at one of the resort's restaurants when we get back)
We figured this was the best options since all of our guests are on the all-inclusive plan. Everyone is really looking forward to it!