<p>Well, you want to do a few things to make grad school easier. It’s really good you have decided that you want to pursue this and have an idea of your field early.</p>
<p>Major in either chemistry or biology or some closely-related subject. If you have interests in both these areas, you can look for interdisciplinary programs or special programs or for things like double, dual, or joint majors. Take a challenging course load that has enough breadth to give you an idea of what you like while at the same time eventually focusing on the kinds of things you want to end up doing. Emphasize the former… you can always specialize in grad school.</p>
<p>As soon as you have narrowed down what you are really interested in - and try to be quick about it - you should try to get involved in undergraduate research. This should be feasible for a decent student at a reputable research university… just ask around the department(s) you are interested in and see if anybody is doing interesting research and looking for students. Take a position making coffee, if that’s what it comes to, anything to get your foot in the door early. If your school lets undergraduates do a thesis (honors program, perhaps, or something) do it. Try to publish papers, that is, to make substantial contributions to projects which get published. Go to some conferences and either present or participate in volunteer programs.</p>
<p>Some teaching experience wouldn’t hurt either. Tutoring or undergraduate TA positions can be useful for (a) preparing you for a GTA role in grad school or (b) for teaching as a professor at a research university later on.</p>
<p>Internships should ideally be of an academic nature… that is, either get internships at places which are well-known for R&D (national labs, government agencies, universities, etc.) or with companies in positions where you will have the primary role of conducting or contributing to a research project.</p>
<p>Keep your GPA high and study hard. Don’t worry about extracurriculars, just do whatever comes naturally and do it well. Apply for awards, especially scholarships, fellowships, and research awards.</p>
<p>If you can manage to do all that, and provided that you go to a good school and get some good references, you will be good.</p>