In Holderness on Route 25,
www.squamlakes.org/education/sailing-lessons
The Lake Winnipesaukee Sailing School is way, way, way back, buried deep in Smith Cove and you waste a lot of time getting past all the moored boats, Fay's Boat Yard boat traffic, Gilford island boat traffic, and the no-wake zone to get out to an open area on the lake. In Holderness, on Squam Lake, the sailing school is right there with quick easy access to the big water on Big Squam, plus they have more adult sailors at Squam.