Check the Foreign and Commonwealth Office Travel Advice before travelling.
Get travel and medical insurance before you leave.
Bring enough money, in the form of dollars or dollar travellers' cheques.
Keep belongings, especially your passport, in a safe place. Carry a photocopy of your passport at all times.
Respect local laws and customs: do not overstay your visa (given on entry).
Beware of pickpockets, street robbery and approaches by strangers in bars and clubs: drinks can be spiked or drugs administered by needles.
Enter next of kin details into the back of your passport.
Don't carry drugs: Colombian justice is slow and the prisons harsh.
Do not travel overland without taking Embassy advice: air travel is usually the only safe option. If you cannot avoid travelling overland, do not accept any food, sweets or drinks offered by fellow travellers: they may be drugged.
Do not enter Colombia overland: the border with Panama is particularly dangerous.
Do not flag down taxis on the street. Always phone for a taxi: you will be given a code to give to the designated driver.