Take deep breaths and enjoy the moment! All of the planning is over, it´s time to enjoy the blessed event!
Have a massage in the morning. This will give you time to relax and reflect before your big event.
Take a long bath.
Eat at least one small meal, you don´t want to pass out at the altar.
Have your hair and make-up done a few hours before the ceremony. If at all possible, have your stylist and make-up artist come to you. This will prevent any "weather" damage.
Start dressing one to two hours before the ceremony and do any necessary make-up touches.
(this tip originally from Wedding Lifetips)