Whatever you can find in Venezuela
In all seriousness, you should find something that's meant for river running rather than lake canoeing. Not sure what resources you have in that city, but I would hope someone in Venezuela can find a canoe with floatation in the country, or at least order it for you.
Generally speaking, this site has mostly kayakers and rafters; we don't know much about canoes. This site is probably a better resource: Kayaking & Canoeing | Kayak, Canoe, and Paddle Resource: Paddling.net
Sorry, but good luck!