Even if you have already booked a great family getaway and are halfway through Summer camp, there are guaranteed to be after**ons when Your Kids simply need something (anything!) to Keep them busy. And while outings to the zoo and water park are all but guaranteed to be easy wins, those $15 (or more) entry fees add up. We've come up with 100 of our favorite Ways to Keep the kiddos Busy both indoors and out This Summer - without spending a dime!