From SFBC:
Bike through scenery and be immersed in history on this five-mile, moderately strenuous ride with climb of 400 feet. Reservations & helmet required; reserve by calling Ranger James Osborne 415-561-4323
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It's a matter of time before a cyclist or pedestrian is killed crossing Lake Merritt Boulevard or I-880's ramps and frontage roads because the channel path is blocked