At 87 miles, it’s the longest continuous off-road segment of the East Coast Greenway, a 3,000-mile collection of multi-use paths linking 15 states and 450 cities from Maine to Florida. With its quaint seaside villages, blueberry thickets, cranberry bogs, salmon-filled rivers, glassy ponds that reflect blue skies and puffy clouds, and dense woods that explode in fiery shades in autumn, the former Calais Branch Railroad Corridor is surely one of the prettiest portions as well.

Portland is a cyclist-friendly city with fantastic urban bike paths, but nature calls and you should answer. About 30 minutes from downtown a century-old railroad line, once a fundamental tool of the Beaver State’s lumber industry has been reforested into a 21-mile-long trail.

The Golden State is lousy with purpose-built paths—seriously we’re talking in the triple digits—and annoyingly moderate-to-outstanding weather. You could ride twice a week for a year without ever repeating a route and see frolicking dolphins, fruiting vineyards, Yosemite’s Half Dome, or swaying palms and Venice street performers without ever leaving the saddle.