There’s no better rush than speeding down a single track on a mountain bike, and if you ask us, the High Sierra of California and Nevada is the place to do it. The 165 mile Rim Trail is a massive multi-use loop that links the high peaks surrounding Lake Tahoe. Roughly half the trail is open to mountain bikes, but some sections depend on the day of the week or season, so be sure to check the official maps and rules before setting off. Arrange trailhead rentals with The Flume Trail or with one of the ski and sports shops in the town of Lake Tahoe. ($45–55/day bike rental, $15 for a shuttle; tahoerimtrail.org)
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