I have been to this field many times as my children grew up. My daughter was just there watching my wife's (She is a teacher) kids play in a tournament and thought this would be a great place for a cache. So here you go. I believe the parking is open all the time. But you need to be watching for lots and lots of people during the week-end games. There is room for swag and I even left a TB and a FTF Glass bead.
Congratulations to sockheadLOUpez for FTF!