Not sure what's more challenging, finding the entrance or the bike trails.

Two trails are for mixed use, the Swayze Falls Trail and the Black Walnut Trail. They are 6.2km and 4.3km and go through mixed terrain. Open fields and forrest, with a few steep passages, some are badly washed out by rain. Several muddy patches, but nothing that is extreme. Hey, you can always push the bike if it's too steep.
There is no entrance fee, so there is really nothing to complain about. I actually enjoyed the ride and the uneven tracks. Many places are very pumpy, my guess is from the equestrians that share the same trails.
More details about the trail can be found at the Friends of Short Hills Park.
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The Challlenge Park is located in Mississauga, Ontario, just north-east of the 403 and Credit River. The Challenge Park is in memory of Ellis Leuschner who passed away as a result of a bike accident.

Find the exact location here. Switch to the Satellite map and follow Wellsborough to the south. This is prime recreation area. Just before the bend, you see a dirt spot (north-east) with trails leaving in all directions, that's the one.
The Challenge Park is at the northern end of the Credit River trail. Continue the trail from here and follow Wellsborough then turn left into Credit Pointe. About 200 meter until you see a sign marking the trail/park entrance. Eventually you end up in Streetsville.
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