no heavy metal, only reggaeton. unless you are out of the city, and then you have more traditional music.
coffee and bananas and black beans are just everywhere, along with feral dogs. and roosters.
don't drink any water, don't flush your TP.
enjoy some Gallo and for goodness sakes, wake up early and enjoy a beautiful sunrise. or stay up late on a rooftop and look at all the stars.
are you going to antigua with the tourists, or staying in the city, or going to lake atitlan area?