Which musicals are the easiest to make for a children theater summer camp?

It's my first time directing a theater summer camp for children (ages 5-14), and I would like for the kids to present a musical at the end of the summer. My question is (for the musical theater experts and enthusiasts out there!) which Broadway plays could possibly have an all-children cast? I know probably anything could be done with only children, but I would like to find a play with a simple production, from the songs to the scenography, so that putting the entire piece together in 6 weeks or so (and with a limited budget) is a feasible idea! Which shows do you recommend?