I went out for a ride today with the six year old and we put out a couple caches for your caching pleasure.
This one is called Dark Phoenix for reasons that aren't entirely clear to me. :)
It should be a very easy find, just hop off your bike, sign the log and be on your way.
The Geocache Notification Form has been submitted to the Wisconsin DNR. Geocaches placed on Wisconsin Department of Natural Resource managed lands require permission by means of a notification form. Please print out a paper copy of the notification form, fill in all required information, then submit it to the land manager. The DNR Notification form and land manager information can be obtained at: http://dnr.wi.gov/files/PDF/forms/2500/2500-118.pdf. Happy caching.