On a power cat, you'l be able to enjoy a 7-night charter. I would recommend Marine Max for a power cat. Flying from Atlanta, you'll have good options and can definitely make the afternoon ferries and do a sleep aboard so you can be off the dock first thing the next morning. Don't waste the time, effort or $$s on a hotel, it's better to get onboard and settle in and you won't have to wait for a midday check in to start your first day.