C.G.
Both Boynton Beach mall and Wellington Mall have indoor play areas. There is a McDonalds in Wellington that has an indoor play land. you can go to the library and hang out in the childrens section - there are usually some toys and they can sit and read books or play on the computer there. Boynton Beach has a great YMCA - you may want to look into what kinds of activities they offer (I believe they have an indoor pool too). You can also go to the Children's museum. On Lake Worth road and the turnpike is Skate Zone that has both ice and roller skating.
That's all I can come up with right now.