The cache IS at the posted coordinates!
We all know that geocaching is not about the numbers. It's about getting outside and having a little adventure. Well, this cache really is all about the numbers. Four very specific numbers to be exact.
The Cache is located at Indian Prairie Park right where the coordinates will take you. However, the cache is secured with a combination lock. To find the combination you will have to visit four of the geocaches participating in The Park District's "90 Years of Fun" geocoin challenge. In each of these four caches you will find one number to the combination.
The combination is: