I bought my dress a plane ticket for the way to Disney. One the way back I just shoved it in the overhead compartment. It weathered both trips very well. I know other girls have shipped their dresses to their hotel or EM, and have had no problems, but that made me nervous, and I didnt have a spare suitcase to shove the dress into. The plane ticket was worth my piece of mind, and the extra room on the plane!
We carried our wedding rings in our carry on.
My DH rented a tux in Florida so we didn't have to worry about transporting that.