I wish I had more responsibilities and work to do. Unfortunately, they were in a time period of transitioning companies (Webasto acquired AeroVironment, which I originally got the offer from). My boss was not very communicative, so I had to be the one to initiate and ask if she needed help, or if there were any projects I could work on.
Don't be afraid to talk to your boss and ask for more to do. If I didn't do that, I'd probably be sitting around for the entire duration of my internship.