Sunscreens containing reef-damaging oxybenzone, octinoxate and octocrylene are not allowed in the USVI as per the 2019 "Toxic 3 Os" sunscreen ban. A list of some allowed mineral-based sunscreens (zinc oxide or titanium oxide) can be found at Island Green Living. Apply sunscreen well before entering the water to prevent them from washing off. Additionally, spray sunscreens should only be applied in designated areas away from people, animals, fruit trees, and the ocean.
Or, wear sun-protective clothing instead; it also lasts longer than sunscreen and offers protection from insect bites and jellyfish stings.
NOAA Infographic: Sunscreen Chemicals and Marine Life.