"D'oh, how do I place a cache here, in a tight spot that is more or less wide open?" Well, like this I guess! You are looking for a bison tube and it is 15+ feet into the scrub. I have a feeling you may be uttering your own versions of "How do I ...?" during the search.
Available in all winter conditions.
Forewarning: there are thorns present all around the cache. Just because the cache is here, doesn't mean you have to try it.
The cache is located in Kiekhaefer Park, one of my favorite near-town playgrounds. This 120 acre park has hilly trails among a wide variety of land types: prairie, scrub, pine, hardwood, pond, and creek. There is plenty to do year round: walking the wide paths, hiking the side trails, mountain biking, horse-back riding, cross-country skiing, snowmobiling, snowshoeing, and sledding.
You are sitting on the Niagara Escarpment, a high ledge (which Niagara Falls plunges over) that exists from New York State through Ontario, Michigan, Wisconsin and Illinois.
Parking is accessed off Kiekhaefer Pkwy at: N 43° 50.200 W 88° 22.100 - near the parking lot is a viewing platform overlooking Lake Winnebago, great for experiencing sunsets. Park hours are 6 am to 10 pm.