The sea is different, the snorkeling lasts longer, the ambiante is not the same the party is good fun,
A typical party boat includes:
Open bar rum, beer, soft drinks
Music + animation
Reef snorkeling
Snacks or BBQ
Premium experience, not just party
VIP type staff (personalized attention, not massive)
Improved menu not only Brunch gourmet or themed food
Premium drinks not only domestic