If you arrive on a Saturday it will be busy. My recommendation is to do a sleep aboard the night before. This allows you to do most of the systems checks (generator works, engines work, water and fuel are topped off, windless works, dinghy engine works, etc.) the night before so you know exactly what you need when the check out person comes to do your walk through. If you don't do the sleep aboard I recommend arriving at the Moorings early and checking in to see if your boat is ready. If it is they will usually allow you access early. When you check in, schedule your briefing right away and make sure the captain is on the boat the whole time, just in case the check out person comes early. If you aren't on the boat and they stop by, they don't wait for you, they go to the next boat. If you want to get off the dock that day, have grocery shopping done and like sailATX said, split your crew up to focus on tasks that need to get done (grocery shopping and storage, fins sizes picked out, etc.). We also do most of our provisioning using Riteway and Caribbean Cellars delivery.

Have a blast but be safe!