You hung out in a hostel, had conversations with other travelers (instead of thumbing through Instagram), and let the randomness of other people and life, not apps, dictate your itinerary. You walk down a street, "oh hey that looks interesting", and wander down a quiet alley that leads to cute cafe, or jump in the back of a tuk-tuk headed to a waterfall that may or may not really exist, but who cares? You're riding the wave. One of the main reasons for travel/holidays is to break from routine, and the single most significant one can do, bear with me Silicon Valley, is to put away that smartphone. Try exercising your intuition instead of apps.
Many folks nowadays have optimised their lives so much that they've needed to create a noise-generator to bring back some humanity.