I don't believe it really matters if you take calculus or not. If I am not mistaken, its not part of the so-called "pre-med prerequisites" for medical school.
What's more important is that you do well on it if you decide to take claculus this summer. If you are just doing the pre-med requirements right now to get ready for applying to med school, don't waste your time taking it. However, if you need to take calculus for your undergrad degree, try to do your very best on it. That last thing you want is to have your GPA get pulled down because of a course you really didn't need to take for medical school admissions.
Good Luck to you!!!!
Rob
WesternU/COMP Class of 2002