Carve out some waves with a clear conscience with the sublime Qudrofoil, the world's first all-electric hydrofoiling personal watercraft. Its maintenance costs are nearly as low as its emissions (which are zero, by the way), all of which are inversely proportional to the amount of fun it provides. The aerodynamic design slices through the waves at up to 20 knots, and its silent motor means you can take it anywhere. Well, anywhere there's water, obviously.

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