Before travelling anywhere exotic (so anywhere that is not NZ, USA, Canada or Western Europe) I always make an appointment to see my GP (who specializes in women's health and travel medicine), I call ahead and advise the countries to be visited, and the Dr has all the WHO vaccination and medication advice printed ready to discuss.
The advice documents always indicates the mandatory (in case of places that have yellow fever), highly recommended and optional preventive vaccines, medications and practices by region within the country (i.e. recommendation for a visit to capital city is often different to those if venturing in jungle areas). For example when I went to Brazil I was only going to be in a malaria region (iguazu falls) for 2 days (and was staying in air conditioned hotel), the advice in this instance is not to take prophylaxis (due to length of time you need to take them) but rather to wear long pants/sleeves and use DEET based repellent (bushmans friend), whereas on another trip where I was in going to be in malaria region of Colombia for a week the use of prophylaxis was indicated and taken.
The doctor and I compare what vaccinations I already have had, what is recommended and then make informed decisions. In addition to having my yellow vaccination card updated (i need to carry this as it has proof of yellow fever vaccination which is needed to enter/leave many Latin american and African counties), I have the Dr issue medical advice letter to carry, which confirms that all travel meds I take with me have been prescribed and also what other preventative actions have been recommended if not a vaccine or medication. I've always done this to ensure no medication is confiscated at immigration, but now thinking it would be great for insurance claims too - to prove that advice has been followed.
My motto is always get a vaccine if it is available, you can claim back part of the costs on health insurance and its better than getting a serious illness, if going to a country with Rabies get the Rabies vaccine, you may not be intending to interact with animals, but a stray dog can bite you almost anywhere.