In the U.K. and Europe, the wealthy have flown to such warmer climates as Dubai, the Maldives, and Spain to escape winter lockdown, says Justin Huxter, founder of U.K.-based Cartology Travel. Americans have more options for tropical bunkers: Hawaii has eased its travel restrictions and borders are open in Mexico, Costa Rica, Belize, and many parts of the Caribbean. After all, what good is a second home at Lake Tahoe or Napa, California, when nearby ski lifts, wineries, and restaurants are periodically inaccessible, as they were for much of December and January?