This cache is placed at the summit of Mt Monadnock. For those unfamiliar with the hill, its about a 3000 foot climb, often pretty strenuous if you take one of the direct trails (white cross or white dot). At some points its steep enough that you'll have to use your hands to scramble up rock faces and boulder-strewn trails. But, this claims to be most summitted mountain in the world, so the trails are well marked and well worn, and accessible to people of all ages. Note that there is a fee to enter the park (currently $3 per person), but with that you'll get a trail map and advice from the rangers.
The cache itself is a clear tupperware container with a white lid. It is not clearly visible, given that on a sunny day the summit can be quite crowded. Hopefully the area of the cache is enough out of the way to gain some privacy while hunting, but some paitence may be required.
Have fun, and be sure to stop at the spring along the white dot trail for a tasty break along the way.