It's a longgggggg dinghy ride from BEYC/Saba to Leverick or Leverick to Saba/BEYC. Especially considering you have 14 people.
If you are set on doin the 5pm tarpon feeding at Saba, I would recommend that you put the big boat on a ball at either BEYC or Saba, and then take their ferry to Gun Creek and back for the car rental and VG exploration day.
If Speedy's doesn't work out for the car rental, Mahogany Rentals is another option who will meet you at Gun Creek with the rental car.
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