| I definately think they are looking for an essay not a list. Basically because a large number of kids who apply have done that "something special" that they want to emphasize. Of course for the average middle class kid it may include working, community service, coursework etc.
If you've done different things over two summers I would try to find a way to weave it together instead of just writing two separate paragraphs. You can either find a common thread to lead into the following summer, or you can describe the reasons for the differences based on interests, maturity, finances etc. | 
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