Placidguy---I,m arriving with a group of about 45 on a Saturday in late October. While it's not usually busy that time of year, if your there at the same time as us without a reservation, it could be a long wait. Usually takes Tropic about 2 hours to get us all over to the island. Just in case, I'd make the reservation. It only takes a couple of minutes to be safe. If you arrive earlier than expected, they'll move you up to an earlier flight to the island.