It can be found northeast of Swan's Pond, next to some irradiated barrels in a templelike structure.
"Still think you boys are out of your mind.
You want to know how I'd do it? Head around the north side and rush the bandstand. Be quick, and you might be able to get some defenses up before he notices you. If you can hole up in there, you might just have enough cover to outlast him.
Whatever you do, DON'T GO IN THE POND."