Streetwalkers in Guayaquil
The previous posts are correct. Things have deteriorated over the years and the pickens are slim for those of you cruising the streets looking for action. Every once in a while, you can find a gem hanging around 9 de Octubre and Jose Mascote on the bench on the southeast corner. Peak times are 9-11 PM. You may find chicas from the la 18 in this area after they finish up their business in the zona, but usually it's the lower end girls you encounter.
Don't venture too far south of 9 de Octubre in this area as it is a known hangout for trannies and cross dressers. Every once in awhile you can find quality just north of the main post office (Aguirre and Chile) or around the downtown De Prati store close by but you'll come up empty more often than not.
To summarize, Guayaquil is not the place to be if you're into SW's and you will be disappointed.
Non-Pro action in Guayaquil and the Outskirts
The place I always had the best luck was in and around the University Of Guayaquil (Quisquis and Tungurahua). Chicas are plentiful and a lot of them go there only to *study* the guys. Other good areas are in the banking district a few blocks inward from the Malecon off 9 de Octubre as the bancarias are some of the hottest looking women in Guayaquil. You won't have much luck on the Malecon in spite of whats been written here in the past.
Outside Guayaquil, it gets a lot easier in the beach areas (Playas, Salinas; Montañita). If you're young and in good shape, you can score with one of the locals with little effort. The best time is the temporada from January to Easter weekend. Plan on spending at least some time in these areas during temporada as Guayaquil gets too damn hot.
One last thing. Guayaquileñas are horny for gringos but they do NOT like dudes that are fat and dress like slobs. If you haven't executed a sit-up in the last 10 years and you are planning on going to Guayaquil to monger, now is probably a good time to start hitting the gym hard. You'll have a hard time getting any non-pro action in Guayaquil if you come here out of shape wearing only loose-fitting jeans and t-shirts. The lyrics from ZZ Top's "Sharp Dressed Man" were written with the ladies of Guayaquil in mind.