A costume theme would be unique, but this is your chances to be a bride. That is something that you are going to want to look back at in 20 years and see how beautiful you were in your gown. You can always do a costume party for an anniversary party done the road.
Check out Historic Spanish Point a little south of Bradenton is Osprey. Laura is INCREDIBLE to work with and I know you could se something really cool up for your October wedding. They have a chapel or a garden and great tents for your reception - http://www.historicspanishpoint.org/Weddings_.htm
Click on each tool to see a sample.