Any visitor who is not staying the night must pay a 5 euro ($5.35) entry fee online before walking into the lagoon city on April 25 - a national holiday and the first of 29 days this year
Paulina Vega, the granddaughter of tenor Gaston Vega, studies business administration at the Universidad Javeriana in Bogota and has been a model since she was eight years old, according to the pageant's website.
Vega triumphed over first runner-up, Miss USA Nia Sanchez, a 4th degree black belt in Tae Kwon Do from Las Vegas, Nevada, who won the US title in June.
Contestants from the Netherlands, Jamaica and Ukraine rounded out the five finalists at the 63rd annual pageant, which was broadcast on NBC from Florida International University in Miami.
Vega is the fourth woman from South America to win the pageant in the past seven years, with contestants from Venezuela taking the title last year as well as in 2007 and 2008.