Questing-Go on a quest for a geocache or letterbox that could be hidden practically anywhere.
Geocaching.com is a great resource to help you out if you are new to geocaching. Plus you can seach for local geocaches near your location. The Dayton Metroparks has some tips for finding geocaches in the Metropark area.
Letterboxing is very similar to geocaching, although each box typically has a stamp and guest book. Bring a notebook along and mark your notebook with the stamp and be sure to sign the guest book too. You can even search by location.