The best advice I can give you is to test your ideas in actual location under realistic conditions to eliminate unpleasant surprises. Work with an experienced coach or wedding consultant if you can, and keep in mind following things:1. THE WIND
Wind can affect many things: temperature, making it hotter or colder; bridesmaids' dresses; everyone's hair; and whether ceremony can be heard. Test beforehand. It can be as simple as moving tables around a corner, or across park to a more sheltered area.
Plan decorations and tablecloths you can anchor attractively; choose weighted fabrics for attendants; warn them about hair thing; and consider need for a sound system and mike clips. If you're renting a tent, make sure it’s wind-worthy.
2. THE COMFORT OF YOUR GUESTS.
Okay, if you're getting married in San Diego, you can count on perfect conditions, but failing that, your event may be hotter, wetter, or colder than many guests would prefer.
If you're having a lot of out-of-towners, particularly, include information about weather possibilities on an insert with invitation along with accommodation recommendations. (I went to an outdoor wedding in Dallas in July; 111 degrees that day, and boy were people from Colorado and La Jolla dressed wrong!)
If it's hot, provide iced bottles of water when they arrive, and hand fans, and if you have a tent, rent fans. If it's chilly, have a tent, warmers, a hot beverage when they arrive, and lap blankets.
3. YOU MUST HAVE A PLAN B IN CASE IT POURS DOWN RAIN.
4. HOW TOUGH ARE YOU?
Come on now, if you're at all fussy type, or prone to nerves, this simply isn't for you. You'll have to manage your hair outside, for heaven's sake.
5. THE CALL OF THE WILD.
Inclement weather - or even just ordinary ocean waves and bird calls – can wreak havoc with still photographs and videos alike. I recall an amateur wedding video where most of sound was wind whistling around. There may also be a fountain or waterfall, dogs barking, kids screaming, birds chirping.
6. DECORATIONS
I've seen even cloth tablecloths blow in wind, turning over glasses, candles and centerpieces. Wind, bird poop, shades of night falling ... Be xtremely realistic when planning your decorations. Actually test them outdoors.