Coolie2

I have recently started hiding geocaches, and I have decided to make most, if not all of them mystery or multicaches, as I think geocaches are generally better when someone has to work to get the final coordinates. The problem is I'm having trouble thinking of ways to make mystery or multicaches aside from bringing someone to a sign, or asking them to research answers to questions. Suggestions on how I could make my geocaches more creative would be greatly appreciated.