It's located just off the Tom Taylor trail in the north end of Newmarket. It's in a small forested area on the edge of a park and some houses. Very common in Newmarket to find these little forests nestled in the middle of things.
Parking is nearby at the soccer fields, or preferably grab this cache on your way while hiking the trail!
You're looking for a pretty small camo'd plastic lock 'n' lock container. There's a logbook, pencil and some small tradeables.