Driving from Guatemala city to Mazatenango, Retalhulehu, or to Mexico you go by the intersection that takes you to the town of Cocales. I have never actually turned into the town but the intersection is a well know landmark. There, buses and cars stop to pick people up and/or get a coco on the side of the road. You can get the pierced coconut with a straw, a peeled coconut to not only drink the water but also eat the meat, and you can also buy small coconut palm trees.
I find it pretty picturesque that the names of the town depicts so well the commercial activity, coco meaning coconut and cocales implying coconut palm tree.