jmejia,
I just sent you a PM.
Basically, Stanford expects you to at least be open to research (defined broadly). It does not have to be basic molecular biology research or anything along those lines. It can be clinical research, research or work in health policy or community service, or something like that. About 80% of all graduating students from Stanford have done some form of research while they were here, which also means that 20% have done none.
Personally, I did the 5 year plan and spread out my preclinical classes to 3 years. During that time I did research through the Medical Scholars program (which gives you $10,000 per project), I TA'd some classes, took Spanish on the undergrad campus, was involved in several student groups, and learned how to snowboard (for starters). Everyone does the 5 year plan differently. Some people get master's degrees or PhD's, or they might go overseas on the Travelling Scholars program for example.
I also agree with Lilycat that research experience during med school can really help you out when applying to competitive residency programs. Particularly at a school that doesn't have grades or class rank (Stanford), it's the outside experiences like research that become much more important when applying.
As far as what electives you can take, you are allowed to take just about any class throughout the university. As far as specific med school electives, go to this website to check out the med school course catalog. <a href="http://www.med.stanford.edu/school/catalog/" target="_blank">http://www.med.stanford.edu/school/catalog/</a>
Hope that helps!