You'll probably be fine depending on how long you go for and what you intend on doing, I know I wouldn't get any if I was there for less than a month or two. Go to a travel clinic to ask there and surf some travelling forums before committing to anything. Also look into what your insurance will cover, some of the pills and shots may seem pricey but a good plan can get you virtually all of your money back.
One thing I wouldn't not go there without are a set of prescription strength anti stomach flu/diarrhea/cramping pills. These can be a lifesaver. Lastly, consider that you can probably buy pills there for much cheaper than in North America.