I went to St Marteen two summers ago. Did not do a wedding there but a family vacation. It is a small island, small airport (few flights in and out), but ate at a lot of nice restraunts, did some diving, some great shopping (its a popular cruise ship port). Went to the casino (nothing like Vegas but still fun). We stayed at a time share. Lots to do for a small island. My biggest concern for a DW would be lack of flights in and out.