Just FYI, we did not book in advance returning from Road Town to St. Thomas last Saturday and both the 10am and 11:30am ferries were completely booked when we arrived at 9:15am. We had to go to West End to catch the Aquatic Rentals 11:30am ferry, which was not full at all. Worked better for me because my condo is closer to Red Hook than it is to Charlotte Amalie but did cause some stress to my friends who were flying out that day. Luckily they made it with time to spare.