If there's one you really want to own, buy it used rather than new. Or check with your friends. They may want to make a trade for something you have. Play computer games at home instead of going to an arcade. Go to the matinee instead of an evening movie.
Matinees are almost always cheaper than the later showings.
Skip the refreshment stand. The food there is always expensive. Check out used sporting goods stores, garage or moving sales, and the want ads for good buys. These items are often in good condition. Sometimes the owners have just outgrown them.