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Best Thrill-Seeking Road Trip: The Road to Hana, HI
Route: Routes 36 and 360, from the town of Kahului to Hana and a little beyond (68 miles)

Brace yourself -- literally -- for the ride of your life. Maui's Hana Highway may sound tropically dreamy, with its lush rain forests, multi-tiered waterfalls and scenic turnouts, but it's not for the faint of heart -- or weak of stomach. The winding, narrow road contains hundreds of curves and dozens of bridges (many of which are one lane), and the first time a fearless local in an SUV zooms by you, you'll wonder where your breath went. Good places to stop and find it? The Ke'anae Arboretum (just past mile marker 16), Upper Waikani Falls (mile marker 19) and Ka'eleku Caverns (mile marker 31).

Runner-Up: La Ruta Panoramica, Puerto Rico