Not the OP, but absolutely don't work in a Dr's office or as a sub in a school for a good atmosphere! What are you folks smoking? Lots of sick patients and/or public schools are not usually fun places to work, unless you really want to go into teaching or medicine.
Part time administrative assistant or receptionist in private industry would be nice. You could try a temp agency?
There is a "Montgomery County MD Jobs to post and share" Facebook group, and occasionally they have some good sounding part time jobs--if you are in MD. If not, check around for a similar group in DC or VA.