This cache will take you to Sullivan Memorial Park, a small neighborhood park and baseball field tucked away in a residential area of Wakefield. It seems to be more of a dog park than a baseball field. Presumably, baseball games are played here on occasion, but whenever I’ve visited this park, all I've seen are dogs and their owners. So unless you happen upon a rare baseball game, muggles shouldn't be an issue as long as you use a little stealth and wait out the dog-walkers.