There are so many reasons to slather on the ol' SPF and then soak up some rays. For one thing, it'll leave you healthier and more energized. "During international travel, the major stress factor is jet lag, or confusion in the physical and energy system about the time zone into which you have traveled," Parth said.
Exposing yourself to sunlight — especially in the first two or three days of your trip — can help you reset. Exercising in the sun can speed up the process, DeMaria added. "Do something really physical those first two days, particularly an exercise you don't normally do: a hike, paddle boarding, a long brisk walk, a bike ride," he said. "And make sure it's outside if at all possible!"