Pursuing the courses you are interested in will pay off not only in making you a well-educated, well-rounded person, but also in extending the scope of your medical school application into important non-medical arenas that are especially attractive to today's admissions committees searching for well-rounded "human" applicants. That being said, it will take careful planning from your very first semester to fulfil requirements (pre-med and for your major) and meet other educational goals, including potential study abroad.
Creating A Master Schedule
By creating a long-term "master schedule" for the courses you plan to take during your four years at Hamilton, you will easily be able to visualize what your pre-med workload will be and determine how to best arrange your coursework so that you strike the critical balance between the courses you need to take and the courses you want to take.
While making your master schedule, keep in mind that it should always be tentative. It is okay to change it and juggle courses around. In fact, it is very likely that you will have to modify your schedule to take into account a course being offered only in the fall or spring; not getting into a class due to a bad registration time; or changing your mind about what major you wish to pursue.