Since English is the main spoken language in the BVI there aren't any special phrases to use. However it is most custom upon greeting anyone you plan on speaking to, or even walking into a room with people (for example a doctor's office or shop), to say "Good morning", "Good afternoon" and "Good night" before saying anything else.  If you do not take time to greet people in this way (e.g. a shop assistant, bar server etc) then you will find that they are a little cold in their dealings with you, manners are considered to be very important and you will be considered to be extremely rude if you do not take time to use them. 

Instead of saying "How are you?" say instead "All is well?". 

Virgin Islanders tend to be fairly reserved people, however if you make an effort to be friendly to them, you will find them to be very friendly back.