I picked up and dropped off at Trellis for EIS this week. I suggest mooring at Marina Cay and then in AM take boat over and pick up Mooring at Trellis and release dinghy there. Maybe the evening before you could do Scrub Island for dinner and sunset. I am not a fan of the dinghy trip across that channel unless dead calm. Marina Cay is not like it used to be but is still a nice mooring area.

if you do CGB make sure to check if Northern swell.

hope that helps