Huffman Metropark has two entrances on Lower Valley Pike which is accessed via Route 4 at Huffman Dam - go down Lower Valley from there. Enter the south (first) park entrance and parking is at
N 39 47.992
W 84 05.413 (corrected 13 Nov)
It was a toss-up whether to name this after the Mad River or “Those Magnificent Men and their Flying Machines.” As a fisherman, the river won the day. The Mad River here gets too warm to support trout, like it does in Urbana. I have caught some nice Smallmouth Bass just north of the cache.
Leave the parking lot following your GPS. There is a level trail all the way to the cache. There is a little broken, rocky ground. Watch your ankles. Strollers and mountain bikes are possible but difficult because of the trees across the path. The path does not appear to be maintained by the park staff. If you get to a trash barrel you have gone too far.
The cache is equidistant to the parking at the north end of the park, but without waders or a canoe it is a very cold wade in swift 3-foot deep water to get to this cache from the north. From the south it is a breeze up the long peninsula.
The cache contains toys for boys and girls of all ages. Have fun. If you are there in spring and see someone wading the Mad with a fly rod, stop and ask if it is me. :)