Here are a few general tips to keep in mind before traveling to some place that would make me jealous:
Don't trust the water, not even some of the bottled water, in any developing country. Because of the high risk that tap or bottled still water might be contaminated, always boil or otherwise treat it before drinking. Bottled sparkling water is more likely to be safe, apparently because the dissolved carbon dioxide forms carbonic acid, which inhibits the bacteria that cause traveler's diarrhea.
Malaria prophylaxis should be taken seriously, and the prescribed medications should be continued for the full directed period (varies with the medication) after your return.
Clothes and bed nets should be treated before travel with insect repellents made for that purpose.
Carry your prescription medications in your carry-on luggage and take a copy of all written prescriptions with you. If you are flying in or out of Colombia, it would probably be better not to be carrying plastic bags of, say, powdered milk.
If you are traveling soon after any medical procedure that includes the administration of a radioisotope (for example, a thallium stress test or radio-iodine treatment for a thyroid condition), be sure to carry a note from your doctor, since you are likely to set off radiation detectors, which will probably make the authorities very nervous.
Whether you are a man or a woman, if you think you may be sexually active on a trip it's a good idea to pack a supply of latex condoms. There are many places in the world where condoms can be hard to find. Also, locally made ones may be of dangerously inferior quality.