Oh, Canada. We applaud you, mighty neighbor to the north. What other country would install a zipline ride at the Embarcadero and charge nothing to fly 680 feet across Justin Herman Plaza? Constructed as a tourism promotion for British Columbia, the ride will send thrillseekers gliding over fountains, art sculptures and, of course, plenty of pigeons from Apr. 8-18. The festivities kick off today with free aboriginal dance performances, a 3D art installation and an interactive video wall of the Great White North. But, really, the allure is in the Ziptrek Ecotours zipline, which starts off on an 80-foot tower and (have we mentioned?) is free. And for that, Canada, we'll stand on guard—or on a platform—for thee.