Perched steps away from the prismatic seas off Guam’s western shore, a water sports shop sat shuttered on a recent weekend morning, its rack of neon kayaks and fleet of Jet Skis collecting fallen leaves.

Down an oceanside road, in the tourist district of Tumon, the gift shop at the Hyatt Regency displayed its beach floaties and fidget spinners in total darkness. Nearby, a shopping plaza adorned with miniaturized street lamps had only one guest: a stray dog sunbathing in the tropical heat. Worn posters on its walls advertised a TV series that premiered last year.

"The hustle and bustle here has just evaporated,” said Madelaine Cosico, the Hyatt’s director of sales and marketing.