The best way to travel between Grenada and Carriacou is by air; the high-speed ferry is the next-best choice, as long as you aren’t prone to motion sickness. The outbound voyage gets a little rough once you’ve cleared the island of Grenada. Reservations for the ferry aren't necessary, but get to the wharf well before the departure time of 9 am in Grenada and 3:30 pm in Carriacou to be sure you don't miss the boat.
Osprey Lines Ltd.. The high-speed ferry Osprey Shuttle (or its somewhat slower sister boat, Osprey Express) makes one round-trip voyage daily from Grenada to Carriacou and on to Petite Martinique. The trip takes 1½ to 2½ hours, depending on the boat. On either vessel, the fare from Grenada to Carriacou is $31 each way. For the 15-minute trip from Carriacou to Petite Martinique, the fare is $8 each way. The ferry departs Grenada from the Carenage in St. George's Monday–Saturday at 9 am and Sunday at 8 am; the return trip leaves from the jetty in Hillsborough, Carriacou, at 3:30 pm. The Carenage, St. George's, St. George. 473/440–8126; www.ospreylines.com.