Local museums and zoos: Most local museums and zoos offer free admissions at least once a week. So call in advance or check out their website to find out when the admission fee is waived. Also, if you have a family/annual membership to a local zoo or museum, you can easily find out if other zoos/museums will offer a free admission or discount (this generous system allows you access to over hundreds of museums/zoos in the U.S.).
Take advantage of membership discounts: AAA members receive at least 10% discounts at over hundreds of zoos, museums, hotels and shops. When in doubt, just show your membership card and you most probably will receive a discount.
Free corporate events: If you or your spouse have a business card or office id, you can easily attend a number of free corporate events throughout the summer.
Recreational shop demonstrations: We like attending free workshops at recreational shops. They usually offer product demonstrations and a craft activity for kids. Bass Pro, Home Depot and Lowes all offer such free workshops for kids.