You can pick up a tacky tourist look costume at most traditional and online costume stores (try www.anniescostumes.com for a couple of variations on the theme). Or consider creating your own take on the hapless tourist. It's easy and inexpensive to do. Simply don knee-length shorts, a loud shirt (a tropical print works well), knee-high socks, and sneakers.
Your must-have accessories: A fanny pack, sunglasses, a camera (the bigger, the better), and a straw hat or baseball cap. Don't forget to bring along a guidebook and a backpack or knapsack for carrying home your souvenirs. Now you're ready to hit the road!