Reports of COVID-19 in Asia were increasing when Jennifer Adler boarded the plane to Thailand this winter. “I almost canceled the trip three times,” she says. “I was checking the number of cases in Thailand every single day.” In the end, it all worked out. Adler spent her last few pre-quarantine weeks on beaches that looked like they were peeled off magazine covers. “It ended up being the most magical experience,” she says. From snorkeling...