Driving in Antigua Guatemala is not a wise thing to do. It is a small place with lots of great hotels, restaurants and way too many cars, so take my advice and don’t. You can rent a bike, a scooter or even better walk since it’s a small city you can walk across it in 30 minutes.
But if you are driving in Antigua anyway, do not park on the red or white line of the street. The red line is on the edge of the sidewalk 10 feet away from each corner and in some streets, mainly the ones closer to the park, you will see white lines, they are for motorcycles ONLY! The reason? There are transit policemen on almost every corner and will give you a $25 fine if you do.
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Also be aware because sometimes you will find little ads on the light poles announcing that you cannot park there. Usually it’s because a procession is going to pass through that street at any moment. If you do your car will be towed and the fine for that is $60 if you want your car back.