We booked the trip for two adults and two children (ages 6 and 8) at a 50% discount. As others have mentioned, it was worth that price—I don’t think I would pay full price. The catamaran was very spacious, with plenty of seating both in the open air and shaded areas. There were about 70 people on board, and even at full capacity (100 people), there would still be ample space.
The open bar had plenty of alcohol for those who enjoy day drinking, and we were taken to a buffet on the island. The buffet was quite average, but that was expected given the price. However, the location was fantastic, as we were right on the beach.
One downside was that the itinerary description on TripAdvisor seemed inaccurate, as it listed more beaches than we actually visited. Still, at this price, the trip was a great deal—it included transportation, the catamaran ride, drinks, and food. I would definitely go again for the discounted rate.