Pleasant Grove Junior High is pretty easy to find. In American Fork, take main/state street east until it does that veer at Blockbuster/Burger King. Instead of angling right, just pull into the median and take the road that keeps going straight. That becomes 1100 North in Pleasant Grove, and takes you right to the Junior high. You'll pass through the light at 100 East (which is the old highway that runs along the base of the mountain), and then pull into the parking lot on the right.

The attached map is from Yahoo. In the bottom left corner is 89 or state street. 1100 is coming from American Fork. The other solid yellow road is 100 East or route 146, which meets state street just off this map (that's where Purple Turtle Restaurant is). The star is on the east side of the Junior high field. You have to park and walk over to it. There's an elementary school right next to the Junior high, and the field is between the two schools.

Convenient Parking can be found on the north side of the elementary in the small parking lot, which is on 1100 North