“This is the best building in the neighborhood,” smiled a visiting architecture critic, and she may be right: The kayak storage hut near the west end of Mission Creek Park shines amid the formula-driven stodginess of too much of Mission Bay. Imagine a graceful tent open at both ends, the long sides arcing up and in until the ribs slide past each other, tepee-like, one side cloaked in translucent blue plastic and the other in wooden slats. Nestled beneath Interstate 280, Kayak House is the most lyrical shed you’ll ever see. It also delivers a moral: The public infrastructure around us need never be mundane.