Some of the best things in life really are free, especially when it comes to family fun. You just have to know where to look. Our Free in Boston Guide lists a multitude of no-cost classes and camps for kids, plus info on when you can visit enriching family destinations like museums and zoos for free.

We've also got the scoop on plenty of no-cost things to do, including the best free annual festivals, free indoor movies, and free summer-only fun like outdoor sports programs, kids' concerts and family film series.

So leave your credit cards at home and enjoy your time exploring Boston—free!