Hi - I have two quick thoughts - neither particularly close though. One is IKEA. In the kids section it is a ton of fun to crawl through the rooms, play with the toys, etc. They also have a ball room and really cheap lunch! It is good for a couple of hours and surprisingly quick to get there from Abington (I live in Abington too!). Second, but further, is Giggleberry Farm up in Peddlers Village. I went early on a sunday to get there when they open (it was either 10 or 11) and it only took like 25 minutes to get there - very simple directions as well. Anyway, they have a Merry go round, a two story ball room, and a toddler play area plus video games for older kids. It was around $15 for access to all three areas, but you may end up figuring out that all three is too much. They have a pizza place for lunch as well. It was a zoo by the time I left at 1 so I do recommend the earlier time frame.
I am interested to hear whatever else says!