In collective itineraries, the tide dictates the schedule, but the group is shared with other passengers. On the private boat, both are resolved: you choose the itinerary — the five islands, cachoeira, Boipeba and Moreré, or a tailor-made combination — and the vessel adjusts to the tide and daylight that interest your group, without depending on anyone else's schedule.
With the boat reserved just for your group, the day starts when it makes sense for you, not at a fixed shared departure time. It is possible to arrive at Pedra Furada at the right low tide for the natural pools, stay longer in Campinhos if the beach is especially empty, or change the order of the itinerary to catch the afternoon light at Cachoeira de Tremembé. No line to disembark, no sharing the lunch pier with another group — just you, the crew, and the entire Baía de Camamu to explore at whatever pace makes sense.