Canoe you believe this? Kayakers, Canoers and rowboat-enthusiasts are fighting a proposed federal ban on all “human-powered” small vessels in the waters around New York City during this summer’s blockbuster maritime semiquincentennial celebration of tall ships called Sail 4th 250 . The US Coast Guard is floating a safety zone plan that would bar the tiny paddle-powered craft anywhere around the city during the Independence Day festivities — leaving fishing boats, yachts and other engine-powered