It used to be that parents who wanted to expose their children to conversational Hebrew over the summer had to travel to Israel. Now a growing number of American Jewish day camps are offering Hebrew-immersion programs, where kids do the standard day camp activities — swimming, arts and crafts, music, zip-lining and field trips — but “hakol b’ivrit.” The rise of Hebrew day camps comes on the heels of an expanding Hebrew charter school movement in the United States. Approximately 3,000 children, not all of them Jewish, are now enrolled in the tuition-free schools, which focus on Hebrew learning and Israeli culture.