For a fun, inexpensive date, try a tour of a chocolate factory. We have one close and it sounds like lots of fun. From their web page:
Chocolate Factory Tours: "The tour includes viewing areas of the candy kitchen and boxing areas. Also an up-close look of how our hand-dipped chocolates are made. Video presentations of How Chocolate is made and the History of Mrs. Cavanaughs Candies are viewed in the theatre room. There are also plenty of delicious samples and treats throughout the tour."
Spend an hour enjoying the sights, sounds and smells of chocolate. Free samples to boot.
Of course, the kids would love to join you for this one.