I went to an all-girls school in NJ and we put on a musical every spring. It was always relatively kid-friendly because three of our performances were during the day and attended by grade schools as a field trip.
The general rule was that unless a kiss was required, male roles were played by girls. If we needed boys we got them from other schools) Sometimes they just cut out a kiss if it wasn't too integral to the scene.
From what I recall, while I was there we did: The King and I (2 boys), Fiddler on the Roof (we had a girl play Tevye!), Hello Dolly, Peter Pan, Oliver (maybe 1 boy), Sound of Music (2 boys). I know in recent years they have expanded and done shows like the Music Man, Charlie Brown, Cinderella.
I like a good rhyme more than a good time