You have to take care of your marriage license. You can either do it through the mail (we used www.aweddingforyou.com) or you can go to a court house when you arrive in Florida.
We went to the court house in Kissimee - it was very easy to get to and we were in there for about 45 minutes - this was part of the exciting build up for us so we always wanted to go and do this in person