I do spend the time and money to go to the health department and get any shot that they suggest, as I do travel a lot to third word or developing countries, even though contracting many of those diseases are somewhat remote you can still get them. If I recall the typhoid will take about 50% of the time, so in other words it is not a sure thing and it quite spendy, infection is spread directly from person to person or through contaminated food or water but is mainly spread from mosquitoes, but with the strong trade winds of AC I did not see a mosquito and you may by quite safe. The malaria shot should be given about 5wks before leaving, if you do not have the time you can get a fast acting short term shot known as a 'Gamma' shot which is a little more costly but protects almost as good. As far as the HepA is conserned everybody should get that, even if they don't leave the states, it hits may areas without warning, it only takes one resturant worker to get it and pass it along to anybody.
If any of you hard core beer drinkers care about your liver just think what a disease of this nature will do for you. http://www.cdc.gov/travel/malinfo.htm http://edcp.org/html/typhoid.html http://www.hepnet.com/
You can do what you want or what the people suggest, but I think it is a snall price to pay for the rest of my life.