Ideally, all travelers should have a travel insurance policy, which will provide some security in the case of a medical emergency, or the loss or theft of money or belongings. It may seem an expensive luxury, but if you can't afford a travel health insurance policy, you also probably can't afford medical emergency charges abroad if something goes wrong.
If you need to make a claim on your travel insurance, you must produce a police report detailing loss or theft. You also need proof of the value of any items lost or stolen. Receipts are the best bet, so if you buy a camera for your trip, for example, hang on to the receipt.
Colombian law stipulates that in emergency situations hospitals must treat you, whether or not you can pay. If you don't have the Spanish to insist on this right, you may have difficulty getting treatment.
There are very few public toilets in Colombia. In their absence use a restaurant's toilet. Museums and large shopping malls usually have public toilets, as do bus and airport terminals and some supermarkets.
You'll often (but not always) find toilet paper in toilets; it's wise to carry some with...
Keep your wits about you, avoid dodgy parts of town and be extravigilant after dark, and Colombia should offer you nothing but good times.
Avoid wandering off the grid, especially without checking the security situation on the ground.
Be cautious when using ATMs after dark; avoid doing so...