Is the engaged couple planning a honeymoon vacation? If so, start the honeymoon early by having a bridal shower/Jack and Jill that features their destination!
For a tropical theme, use leis, straw skirts, coconut drinks, and exotic appetizers such as mango salads, star fruit skewers, and pineapple beef! Use sea shells, bright floral arrangements, and rounded pebbles or stones as decorative elements. Package small bottles of sand with a message attached with raffia as thank you gifts for the guests.