My first essay: One day in Mexico City

One day in Mexico City
Spend Spending a day in Mexico City is awesome because there are a lot of funny places to visit. One of the most funny places is the downtown, that place where you can find museums, art galleries, traditional buildings, street clows clowns and peopel people from a lot many / a lot of countries.
Also you'll You'll also find a central park called Alameda central where is El Palacio de Bellas Artes, a representative building of Mexico Mexican art, is located.

Very good text! Keep improving. Be careful with the -ing use.

My first essay: One day in Mexico City

One day in Mexico City
Spending a day in Mexico City is awesome because there are a lot of cool places to visit. One of the best places is downtown, where you can find museums, art galleries, traditional buildings, street clowns and people from all over the world. You'll also find Alameda Central, our central park, which is where "El Palacio de Bellas Artes", a building showcasing Mexican art, is located.

My first essay: One day in Mexico Cit

One day in Mexico City
Spending a day in Mexico City is awesome because there are a lot of fun/interesting places. One of the most interesting places is the downtown, that place where you can find museums, art galleries, traditional buildings, street clowns, and people from a lot many different countries.
Also, you'll find a central park called Alameda Central where is El Palacio de Bellas Artes (The Museum of Fine Arts), a building representative of Mexican art, is located.

cuando dice "funny", tiene el significado "extrano" o "ridicula" en este contexto. creo que lo que queres sea mas o menos "divertido" (fun) o "interesante" (interesting). 

si habla de la arquitectura del edificio - yo diria "A good example of Mexican architecture"

good job.