Use your travels to become more antifragile

Next time you want to go on vacation, choose the hardest and longest route.
Try taking less luggage for example. Traveling in uncomfortable circumstances will make your trip even more rewarding.

Travel alone more often.
Visiting a new country is challenging enough, but if you want to up the game, travel solo! Better yet, leave time for adventures. Just plan on landing in the destination city and let circumstances decide the rest.