Some ideas of where to go during the intermediate days of the festival of Passover.  Many are free – especially for children.  Note the Geek picnic in Jerusalem.

http://yeahthatskosher.com/2016/04/things-to-do-in-israel-chol-hamoed-pesach-passover/

http://www.touristisrael.stfi.re/geek-picnic-in-jerusalem-israel/18219/?sf=rkzdpa