St Barts requires all visitors to be fully vaccinated with the booster to enter. If you do not have a booster shot, the second vaccine cannot be older than 7 months. If it is, you will need a negative antigen test not older than 48 hours.

Anguilla is still not allowing charter boats entry for snorkel trips.

Saba: All vaccinated travelers require PCR test taken maximum of 72 hours before arrival or a rapid antigen test taken a maximum of 48 hours before arrival. This does not apply to daytrip passengers. ALL persons entering Saba must fill out the Saba EHAS entry form within 24 hours of arrival and receive approval before travel,

From Auqamania website