There are some legal requirements when getting married in the British Virgin Islands which include:
You must be in the British Virgin Islands for a minimum of 3 days prior to the wedding service and after having made application for your marriage license.
You will be required to purchase $110.00 in postage stamps if you have been in the territory for less than 15 days prior to the ceremony or $50.00 in stamps if you have been in the BVI for 15 days or more.
You will require passports as proof of identity and to establish your date of arrival in the BVI. For further information visit http://www.britishvirginislands.com/ntk_wh.htm