(Find more on theTrailLink websiteoperated by the national Rails-to-Trails Conservancy.)

Just hop on a bike.

This crushedgravel and limestone pathleads through the ponderosa pine forests and high plains ofSouth Dakota’s Black Hills.

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Along the way, the trail crosses 100 converted railroad bridges and passes through four hard rock tunnels.

Mickelson Trail AdventuresandRabbit Bicyclesoffer rentals and shuttles to all 15 trailheads.

Insider tip:Cyclists can easily detour to landmarks like the Crazy Horse Monument and Custer State Park.

Bicycle riders cross a bridge over the Youghiogheny River on the Great Allegheny Passage trail

With hotels and bed and breakfasts along the way, many riders make this a four-day trip.

Monterey Bay Coastal Recreation Trail

Distance:18 miles from Pacific Grove to Castroville, California

two people riding bikes on a rails to trails bike trail in front of a tunnel

Great Allegheny Passage Bike Rail Trail

Monterey Bay Coastal Trail