I know you said "not" but if your reasoning for the job is purely money, then you could look into research assistantship. They require very few hours and typically pay fairly well (10 an hour I've heard). If you really want something non-law school related, go for it. I know people that just did non-legal jobs their first summer and were fine (a while ago and they went to great schools).
no one will care, and if you put something like waiting up on your resume, no one will care, they will think you are motivated.