It is roughly a 15 mile sail around STT to the North End of STJ. In January the sunset will be right at 6 PM. I know Twanger has done it many times, but he is underway sailing a CYOA boat to the SVI. Not much help - sorry.
Christmas Cove is always a back up if you get a late start.
“Every time I open a bottle of wine, it is an amazing trip somewhere!” José Andrés
