George,

After a ton of research I think I finally understand the quarantine requirements...

You may now leave the dock whenever it is feasible for you to go...you do not need your Day 0 results to leave the dock.
If you do not have your Day 0 results you can only go to the following quarantine anchorages...

Benures Bay, Norman
Soldier Bay, Norman
South Bay, Peter
Spring Bay, Peter
White Bay, Peter
Little Harbor, Peter
Great Harbor, Peter
Deadman's Bay, Peter
Hallover Bay, Cooper

If you do have your Day 0 results you may go to any of the quarantine anchorages.

You may go ashore at all the quarantine anchorages except for Little Harbor, Great Harbor and Deadman's Bay on Peter Island. Although I think you have to wait until your Day 0 results are negative.

You can snorkel and swim but you are supposed to stay within 30 feet of your boat which seems odd if you can go ashore (assuming shore is much more than 30 feet from your boat).

Hope this helps. We will know more after our trip in less than 2 weeks!