Valladolid [1] is easy to get around. It’s laid out in a grid pattern with even-numbered streets running north to south, odd-numbered streets running east to west. The central plaza at the center of the city, is bordered by Calles 39, 40, 41, and 42.
Links:
[1] http://www.moon.com/destinations/cancun-the-yucatan/the-state-yucatan/valladolid