NightOwl Reviews has web scavenger hunts. The idea is to visit a number of websites, gathering snippets of information to be able to answer the questionnaire. Some page visits are mandatory, and others voluntary, depending on how many chances of winning you want.
It's easy, it's fun, and the prizes are great, one can win gift cards, books, and gadgets for hundreds of dollars. I'd play if I wasn't a sponsor!
If you have any interest in books or shopping from Amazon, I think you should enter. The chances of winning should be pretty good. Click here, and play!