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)