On July 1, the island started welcoming travelers from the Caribbean, Europe, and Canada, then, on July 10, Americans were also allowed to visit the country. The government implemented the “Health and Happiness Code” before reopening the borders, which consists of guidelines for tourism-related businesses and is mainly focused on hygiene protocols.
American travelers must fill out a health declaration form upon arrival. Also, people traveling from the following states have to present a negative COVID-19 test result taken within 72 hours before departure: Alabama, Arizona, Arkansas, California, Colorado, Florida, Georgia, Idaho, Iowa, Kansas, Louisiana, Mississippi, Nevada, North Carolina, Ohio, Oklahoma, Oregon, South Carolina, South Dakota, Tennessee, Texas, Utah, Wisconsin, Wyoming. Another option is to get tested when arriving at the airport, but the visitors will have to quarantine until the result is ready.
Source: Travel and Leisure