Look under a rock. Traditional to take something, leave something.
Please post a picture of the site and tell about this area of the park. It would be awesome if you linked the post of your opencache at www.facebook.com/wehrnaturecenter.
This cache is available from dawn to dusk. Parking outside of Wehr Nature Center.
Whitnall Park includes Wehr Nature Center http://goo.gl/KFBqt
(hours 8 am - 4:30 pm) and Boerner Botanical Gardens (grounds open till dusk through October 7.) There is a fee for these areas. Geocaching is recommended in the other areas of the park. Parking in designated areas. Contact Pat Fojut at the center for more information. 414-425-8550.