A warning to pedaling users of Google Maps: If you're headed from Eastlake to Capitol Hill, you may be routed through the Colonnade, a sprawling mountain-bike fun park that you have no business approaching without a helmet, crash pads, and dual suspension. In other words: Turn back, townies. But if you've come to ride, you can do no better than this extraordinary technical-skills site, with its ingenious ramps and jumps assembled by a dedicated volunteer crew. Few non-cyclists know about the park, which is probably for the best: Imagine how quickly the frustrations of car captives on I-5 would multiply if they knew daredevils were flying beneath them. HANNA RASKIN 1600 Lakeview Blvd., 233-1509.