There are plenty of arts camps within both cities. If you see some you like, list them and then people can give opinions.

You want to send your kid to camp for the one week you are in Boston?

We're thinking of being in the Cambridge/Boston area this summer for a week in late July or early August. Are there any good camps we should check out?
Interested in music, gymnastics, arts/crafts/sewing, nature -- but open to anything.