Child's Play Museum located in Weymouth, MA is another great place for the kids to run around and enjoy some fun activities such as trains, ball machines, dress up areas/pretend areas, hands on activties and story times. I"ve been going for the past 4 years and love to go when the weather's not cooperating for outdoor play. My kids are exhausted afterwards too! The price is $5.00 per person (including adults which is the downfall). I believe infants are free. If you live in Weymouth and hava a library card, you can visit the library website and get a pass for 2 free admissions. They also have b.day parties there as well.  Enjoy!