<p>OP,
You could use summers for either. As far as I know, if you do enough during school year, summers could be pretty free for any opportunities your heart desires. Many pre-emds gradute with combo major(s)/minor(s) anyway, and many of them have them in completely un-related areas, like Bio/Music/ Neuroscience or Bio/Foreigh language or Bio/Art - I would not recommend this one as Art is extremely time consuming.</p>