We are sort of like human Roombas. We bounce around a new area until we've mapped it out in our minds.
In order to learn Playa del Carmen, we walk to the beach. However, rather than always walking down Calle 2, our street, we vary our access to the ocean. All the streets are even numbers, but sometimes there are two. The avenues run parallel to the water and the larger ones are multiples of 5.
Yesterday was the first time we walked down Calle 8. We hadn't seen the Municipal Plaza. It was a great day to take pictures of the huge Mexican flag flying in front of the city building.