Your newspaper is full of coupons for inexpensive meals for adults and families alike. Share your food. Don't order a drink. Go out for lunch instead of dinner. Just go out for dessert.
Movies are usually half price for a matinee.
If you are patient, that new Mel Gibson movie will turn up at the discount theatres in a few weeks. If these ideas don't appeal to you, stay home and make it a Blockbuster night. Go on a bike ride. Go to a museum. Take a drive in the country.