Object Hunt
Most scavenger hunts entail collecting objects. Prepare a list of free items that the hunters can find in various civic locales: deposit slips from bank, menus from restaurants, pens with the logos of various businesses on them, coupons for different stores, and brochures from local museums and tourist sites. All of the objects on the list should be free and the players should carry bags to hold them all.
Photo Hunt
A photo scavenger hunt doesn't involve collecting any items. Instead, participants use portable cameras (such as the kind found on a cell phone) to take pictures of interesting sights around town. Your list can start with notable landmarks, such as a statue, a war memorial, city hall and historic sites. Then move on to more esoteric items, such as an unusual model of car, a bar with a neon sign, a license plate from another state or a 24-hour coffee shop. You can also request pictures of people: kids in the park, someone walking his dog, a meter maid or traffic cop on the job, or someone with an unusual hat. Instruct the hunters to get the people's permission before snapping their photos.
Information Hunt
Information, in this game, means facts or details that the players must hunt down. They should carry pencils and notepads with them to write down what they find, and they can't use the Internet (that's cheating!). Some examples of information to track down are: the phone number of a particular booth, the number of entrances at a specific public building, the price of gas at a certain station, the names of the ticket takers at a local movie theater and the type of product being advertised on a specific billboard. This requires a little legwork beforehand, so that you know the details yourself and no one can cut corners with a little detail fudging.