It's the 70th minute. Your legs still work, your GPS numbers look fine, and yet the pass you'd normally see three moves early just isn't there. In tennis it's the fourth set: the second serve that was automatic in the first hour suddenly feels like a coin flip. Most coaches would call that "tiredness." The research calls it something more specific, and more fixable: cognitive fatigue.

Stockholm looks sharp from the Strandvägen waterfront. But the real payoff starts where the city ends: an archipelago of roughly 30,000 islands, pines that took root around the time the Mayflower sailed, and a Viking-era main street still running on its original line. This guide to the best day trips from Stockholm is built for the traveler who plans his own route, whether that's behind the wheel of a Volvo, a Range Rover or a 911, or clipped into a carbon frame.

Walk through any major U.S. terminal at dinnertime and you will see the gap. Travelers who eat well at home end up choosing between a greasy burger, a $14 bagel, and a bag of candy. Meanwhile, the quiet rooms with real food and hot showers sit behind doors most people cannot open. That gap is where airport lounge business development gets interesting, and it is exactly the kind of gap a grocer like Whole Foods Market is built to close.