[Incidentally, here's a list of things you should do if you want to irritate your summer mentor.]
Also, I believe the main thing to ask yourself is this: Look around at what the other people are actually doing while you're there. Look at what you're doing. Do you like running reactions and purifying products? Could you do it every day, now that you've done it for a couple of weeks or a month?
If you do like it, then you might consider laboratory research as a career. If you don't like it, then perhaps you should think about another field.
So I'll throw it out to the readers -- what advice would you give summer students?