Check out this certificate for a One Full Day Rental of One Standard Canoe, Single or Double Kayak, or Stand-Up Paddleboat from Paddle Boston: Charles River Canoe & Kayak. Expires 2/20/2022.

From their website: "Charles River Recreation is dedicated to providing affordable and accessible outdoor recreational opportunities in the Boston, Massachusetts metropolitan area. Today we operate Charles River Canoe & Kayak (offering canoe, kayak and paddleboard sales, classes, guided trips, and multiple rental locations), Weston Ski Track (located at the Leo J. Martin Golf Course in Weston and offering cross-country skiing and instruction on groomed, lighted trails), and Kendall Square Community Ice Skating (a refrigerated, Zamboni-maintained ice skating rink in Kendall Square, Cambridge)."

https://paddleboston.com/