TravelTalkOnline Forums Travel and Vacation Forums British Virgin Islands Seasonal slip/mooring in Charlotte Amalie

Unlikely to find a mooring for seasonal rental that time of year - but a possibility once you are here asking around.
Plenty of dock space, Crown Bay Marina, Yacht Haven, possibly Sapphire Marina.
Plenty of anchorage room in different areas if you are aboard, and maybe move to a marina for times you are off island?

You might post this on the USVI forum for some different responses.