OK, here's the thing:
The ladies group at our Church holds monthly meetings called "Sweet Monday." I have been asked to provide the cake. Here's what the flyer says:
Theme for the Evening: "Travelling Light" by Max Lucado.
Bring a favorite photo or souvenir from a vacation that you have taken.
Tossed Salad/Taco Salad Supper.

My head is spinning in a lot of different directions right now, and I need some help in guiding me to a final decision on this cake. I know there are some wonderful, creative minds out there that I need to be channeling right now.

Thanks.

This may not be it, but I did a cake for a couple going on their honeymoon that was a white square cake, and I piped yellow borders and then in red I drew all the lines of our local road map for the general area around our city, with major names of towns etc, a little run sugar car and a sign that said 'Montana or bust'...They loved it.

I was just remembering a cake I saw on Ace of Cakes. They made postcards from different places (out of gumpaste I think). And if you wanted you could combine the map idea with the postcard idea. A map with little postcard signs sticking up out of the cake to mark the states or cities. Maybe Rt. 66.

Great ideas. That would be so cool. Thanks for those ideas. I'm lovin' it, lovin' it.

maybe a suitcase cake would be nice