The cache is a medium-sized clear lock 'n lock style rubbermaid container. The tradable contents are suitable for kids. The closest place to park is at Sholan Farms.
To solve the final coordinates, you must first solve this puzzle:
This is a multi-step puzzle; you will not be converting the above drawings to coordinates in one step. You can check your answers for this puzzle on Geochecker.com.
24-Dec-2012 UPDATE: The city of Leominster is in process of moving the trailheads for the Monoonsnoc Trail in the area. You can no longer park in the old location. However, they have created a new parking location directly across the street from the Sholan Farms main building. A new (as-of-yet unmarked) trailhead is at the far back corner of the town-owned orchard, nearest to the cache location. Please avoid any neighboring private property.
25-Nov-2013 UPDATE: Click here to see the updated parking and area trails.