What had happened? We never used to fight. In trying to understand what was making us so unhappy, we found ourselves reminiscing about a trip we’d taken when we were still living in Atlanta to a sleepy surf town in Costa Rica. We’d met people who traveled from place to place, staying for weeks or months at a time, moving on a whim, whenever fancy would strike. The idea seemed irresistibly appealing: a life driven by experience and adventure, not by a desire for more things.