When I hear of a tourist trap, I think of something inauthentic. Something sold to tourists at jacked up rates marketed as something locals do, or is only available in that area when it's not.
But I have seen some lists and discussions that have left me utterly befuddled. I heard the Grand Canyon being mentioned as a Tourist Trap?! The Grand Canyon?! It's a World Natural Wonder, where else am I going to experience it? The Jersey Shore? Hell, going to the shore after prom is practically a right of passage in Jersey. Universal Studios/Disney World?! I mean... OK now I'm just confused.