We've done the EPCOT fireworks cruise (no experience with MK - not sure which you're looking to do). But you pay for the boat and a captain, and up to 10 people in your group. If you only have 6, more snacks and more room for everyone - but the same price whether you have 10 or are going solo..... FYI - be ready to book right at 60 days, they are very popular.....