This cache is hidden in a trail at Stony Brook. Through all 3 years of middle school, I participated in cross country. This is the trail we used to go on and I hid my cache here.
To get to this cache first start at the Stony Brook track area. From there take a turn into the trails. There you will get in on the second trail, which was my cross country trail. Continue on the Nashoba Trail (Red trail) until you get to a big hill along the trail. There you will climb up the hill and find the cache hidden.
Good Luck!
Note: I highly recommend to refer the WA cross country trail map at the start of the trails area in Stony Brook.