To add on to this - anyone have any experience fishing between St John and St Croix? This is probably the only reason we would attempt the trip down there.

Have thought about building it into a 7-day USVI/SVI trip. Down to St Croix from St John and back up to Culebra, hoping to take advantage of prevailing wind direction. Wouldn't attempt if it was going to be an uncomfortable ride for the crew.