[dismamx2]

My dd was on a J1 this summer and spent time travelling after camp/working. I booked Megabus for them from NY to DC and a return a few days later. It was $20 - $25 each way, took about 4 hours and they were happy with it. You can also reserve your seats for $2 ea.

They did think about going to Boston from DC (instead of back to NY) but it would've been 8 hours and that I think that is too long to be sat on a bus.

If it's cheap and cheerful you want it's very do-able but if you want more comfort look at the alternatives.