There are lots of things you can do. You can go to another professional school (dental, pharmacy, PA, etc). You can get your Ph.D and go into research/academia. You can go into teaching at the high school or elementary school level. You can work in industry in many different fields. I know a few people going into food science and a dear friend of mine with a molecular biology degree is now the head brewer at a local brewery. You could do something that has nothing to do with biology--I know a guy who is working as a financial analyst now. The future is what you make of it!