
Colombia is the 26th largest nation in the world and the fourth largest in South America, with an area more than twice than France. Colombia is bordered on the northwest by Panama, on the east by Venezuela and Brazil, and on the southwest by Peru and Ecuador. Through the western half of the country, three Andean ranges run north and south. The eastern half is a low, jungle-covered plain, drained by spurs of the Amazon and Orinoco Rivers, inhabited mostly by isolated tropical-forest Indian tribes. The fertile plateau and valley of the eastern range are the most densely populated parts of the country.
By A I R
The international airline company of Colombia that also operate on international levels is Avianca.
Other companies that flies to Colombia from international destination are: COPA, British Airways, Continental Airlines, American Airlines, Varig, Iberia, Mexicana de aviacion, Iberia, Aerolineas argentinas and Air Canada. There are many direct flies from Panama, Lima, Madrid, Montreal, Toronto, New York and Miami to Bogota.
If you are coming from Southeast Asia, you could have a stop on LA airport before take another plane to Colombia.
Approximate flight time from some cities to Santa Fe de Bogota:
Tourist Visa
If you live in a country that have a restriction please go firts to any colombian consulate or embassy in your countr. For more info please visit: www.cancilleria.gov.co.
But if you are European, American, Canadian, Japanese or Australian, don't worry, you don't need any visa, and you can stay here by 90 days. Enough time! 
You can extend your stay in Colombia, just go directly to office of Immigrations Affairs, in Calle 100 No. 11-27, Bogota.
Don't forget to bring with you papers as
Studend card, International driver's licence, Vaccination certificates, travel or medical insurance.
Currency and Currency Exhchange
The official currency of Colombia is peso ($). Entering or taking out money, in this denomination or in any other, is restricted and should be declared on entering or leaving the country.
Customs
When you arrive, you will receive a Baggage and Currency Form Declaration, you have to fill it and sign it. In this form you must to declarete your personal effects, merchandise and currency amount that it's bringing to the country.
Duty-free entry of merchandise
The traveler may bring duty-free merchandise into Colombia in addition to his personal effects.
Conditions of duty-free merchandise:
For further information, inquire at the Airport Services Headquarters, Tel: (+571) 425.1000 ext. 2588 and 2083, or fax (+571) 413.9459.
Transport of pets
The requirements for transporting pets on international flights are:
For further information, call 425.1000 ext. 2297 – 2330.
And finally... Prepare a camera and Enjoy! 
Metropolitan Basilic of Medellin
Many people does have a mistaken idea about how is truly Colombia. News and Tv show us a very troubled and dangerous country. After 2002, when Alvaro Uribe Velez rises as a new President of Colombia, established a new Democratic Security Policy. After this, Colombia started a new age; kidnapping, murders, robery and more were controled.
In the last years it have been demostrated that if you are a traveler that is going spend one or two weeks visiting Colombia, it archeological zones, Bogota, Cartagena, Medellin, Santa Marta, Volcanos or the Amazonia, is very probable that nothing happens to you.
In Colombia the tourist never has been declare target of none armed groups into Colombia as FARC or ELN.
In fact, move around the country requires some precautions, inside the country have been development a security culture, very advanced than many other countries. Colombians are usual to see preventive measuring against terrorism.
At this time, tourism foment it turned as a state policy; this policy has been very succesful, and many colombians and forein people has taken colombian highways, and finally they feel ver safety.
Summary, it's perfectly possible to trip for many zones inside Colombia, with an apropiate advice and normal warnings.
However you must to have some precaution, please read this and your stay in this country will be more pleasent.