When planning an outdoor ceremony, look for a dramatic backdrop -- such as the ocean, towering trees, and mountains -- against which to exchange your vows. In an open area, you can use guests' chairs and decorations to define the ceremony space. Take care to enhance, not overwhelm, the natural beauty around you; an aisle for the processional can be created with stones or flower petals. Since it can be hard to hear outdoors (especially if the wind is blowing or the waves are crashing), think about using microphones so that guests will be able to listen to the words spoken during the ceremony.
Outdoor Weddings: Ceremony Spaces
Martha Stewart Weddings, Volume 25 2003