I think passport invitations or Save The Dates are a great idea (event though you do not need a passport to visit the US Virgin Islands!) as you can cram some really great info in their booklet style. This one popped up on my Etsy homepage today and I just loved it!

Check out the listing for other great stuff: http://www.etsy.com/listing/60033535/deposit-passport-wedding-invitation-or?ref=fp_ph_26&src=favitm