By taxi
Taxis are a fast and affordable way to get around the city. Only use official cars and it is strongly recommended to call for one if possible you may call the local numbers 444 44 44, 555 55 55, or 660 60 60 and ask for one, your name and destination will be registered in the head office. Make sure the driver starts the meter running. The meters count units, not in the local currency. The minimum fare during daytime is 3,700 COP, during nighttime it's 4,600 COP. 14 units equal 900 COP. Do not leave your luggage inside the taxi while you are not, it sometimes happens that drivers get off as soon as you are out the taxi and your luggage is still in the trunk. In any case, many of the taxi drivers are nice and gentle people and have some good stories to tell, so hopefully you speak or understand Spanish at a reasonable level. But be sure to pay what they ask because they would call the cops and will not let you get out until you pay the full fare.
By bus
MIO - Masivo Integrado de Occidente
Inaugurated in March 2009, this transport system consists of large blue buses running in exclusive lanes with enclosed stations and offers the best option for local transit. All buses are air-conditioned, clean and safe. A one way trip costs 1,600 COP with no discount for bulk purchases. The system continues construction of new lanes with the eventual goal of comprehensive coverage of the metropolitan area. (http://www.metrocali.gov....)There are 23 urban transport companies to travel around the city. You may ask someone for a route, the local people are very eager to help. A regular trip costs 1,500 COP.