L.O.
http://www.visualvoices.net/publications/
There is a WONDERFUL book - the link is above - called Playgrounds of the North Shore. I am not associated with it in anyway - I just got a copy of it when it first came out a few years ago, and it has been a Bible for me. It tells you everything you need to know about a playground from whether there are bathrooms to what age it is appropriate for - just EVERYTHING. But - if you don't get the book (which, believe me, it is worth the investment) - there is the Amesbury playground on Friend Street, there is Field of Dreams in Salem, NH (don't know the street name, but starting at Toys R Us - take a right out of the parking lot, take your first left, and the playground is on the left). Nothing too great in Haverhill, but in nearby in West Newbury is Action Cove on Bachelor Street - just off Rte. 113. Good luck and have fun!