which countries can Colombians visit without visa?

Answer 1

Try this site, just check all countries you are interested in:
http://www.delta.com/planning_reservations/plan_flight/international_travel_information/visa_passport_information/index.jsp

Argentina, Barbados, Bermuda, Bolivia, Brazil, .....

I checked the A and B for you, and the countries near you can be visited without visa.
(Check all and double check before traveling, go to the sites of the embassy or consulate for your country before traveling.)
This is a commercial site that might not be up to date.

There might be a list somewhere on internet, maybe in the information of the minister of foreign affairs, but that is most likely in Spanish and I would not be able to read it.