Check out this steal of a deal for The Crayola Experience in Easton, PA.
Pay $20 for 4 admission tickets and a $10 off $30 store coupon.
This place is great! I went to college at Lafayette College which is located up the hill from The Crayola Experience (within walking distance). If you go, you should take the short drive up to campus and walk around. It is absolutely beautiful in the spring with all the flowers and trees in bloom to compliment the gorgeous buildings.
Also, go grab some ice cream from The Purple Cow. It is only a block from the Crayola place and they make all their own ice cream and cones. So delicious!