214 Main Street, Chatham, NJ- located in the back of the library.  Great playground for toddlers. The kids had a great time, plenty of playground equipment adjacent to a fenced in pool (for town residents).  Really nice people were there this past Sunday.  I really enjoy Chatham parks.  Partially fenced, and there is a basketball court and ballfield there too.
From Amy’s Listing:

Passaic & Main St

From Route 287 take exit 37/NJ 24 E. Take exit 7, JFK Pkwy toward River Rd. Merge onto JFK Pkwy South. Make a u-turn to get onto JFK Pkwy North. Take the Rt. 124 W ramp toward Chatham. Turn slight right onto Main St. This park is behind the Chatham public library.

Really nice playground with three separate play areas. The town pool and a couple ball fields are in the same complex. A great place for a play date. Right in downtown Chatham amidst tons of great shops.

Parking: Smaller lot behind the library
Picnicking: A few tables near the play area
Handicap: One red chair swing, park accessible, equipment is not
Climbing: Ladders, tubes with plexi-glass see through tops, corkscrew pole, parallel bars, rings, monkey bars
Playthings: Tic-tac-toe, storefront, looking glass, Lincoln log theme
Slides: Three toddler, one tube, one corkscrew, one chute, one bump
Sports: Two baseball fields, one half-court basketball, town pool
Swings: Five toddler, four full size, one chair

Make a Day of It
Visit the Chatham Library dine at the Best Little Luncheonette and shop for toys and books at Jabberwocky.

For a great town summary, check out Sue Adler’s Chatham Town Page.