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Old Quarry Ocean Adventures. Departing from Webb Cove and passing Stonington Harbor en route to the outer islands, Captain Bill Baker's refurbished lobster boat takes visitors on puffin-watching, whale-watching, sunset, and lighthouse trips. There's also a three-hour Sightseeing and Natural History Eco-Cruise that goes by Crotch Island, which has one of the area's two active stone quarries, and stops at Green Island, where you can take a dip in a water-filled quarry. There are all-day day trips to bike or kayak on nearby islands, including Isle au Haut. 130 Settlement Rd., Stonington, ME, 04681. 207/367–8977. www.oldquarry.com.