Hike or bike along the York Heritage Rail Trail. It's flat and friendly. There's a nice parking lot in the town of Railroad. Pay attention at the railroad crossings. Watch for muggles. Bring your own pen.
DO NOT CLIMB THE HILL. Small container is nestled under rocks just a short reach from the edge of the trail. Children may be able to see it. Make sure container is secure after putting it back in its hiding spot.
Trail web site includes a map.