Now those look like comfortable Tuk-Tuk rides. I was miserable in Bangkok riding in one as the heat, smog, and exhaust fumes made is almost unbearable. We switched to taxi's and the price wasn't that much different if you haggled some. Lake Atitlan looks like a wonderful and clean place to visit!
These are the India version of Tuk Tuks, and not the Thailand version, I think they go slower, and make less of the Tuk Tuk Tuk Tuk noise.