Taking a big trip doesn't have to mean returning home with jeans that won't button. Sign up for a destination marathon (or a half), and you'll burn plenty of calories—and feel zero guilt when you eat them all back after crossing the finish line. The bragging rights don't hurt, either.
Runners get their fill of gorgeous scenery in this small race (only about 1,000 people run each year). The course starts in downtown Reykjavik before passing the ocean, the Esja mountain range, and the Snæfellsjökull glacier. Bonus: Temps that time of year average about 58 degrees, ideal marathoning weather.
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