Photographs are wonderful, if perhaps obvious, vacation souvenirs. And they're great fodder for family traditions, too. During your trip, make a tradition out of each stop. For example, take a photo of your children in front of the iconic marker at each state line.
Don't let the fun end when you return home. You can create a family T-shirt using a photo you took, a design by your resident artist, an annual slogan (like "5th annual Brown family vacay") or a list of places you visited on your "tour." Local or online shirt printers can turn your ideas into wearable, personal souvenirs, or you can use home-printed iron-on transfers to make your own.
If you collected little treasures along your way, show them off instead of putting them in an out-of-sight place for storage. Use a framed memory box to display rows or groupings of sea shells, tree leaves or other objects from your vacation, like the witticisms contained in fortune cookies [source: Martha Stewart]. Seeing the collection will trigger pleasant memories, and creating the visual art may become a family tradition, too.