Most of the streets (but not all) in Valladolid are one-way. Even-numbered streets run north and south; odd-numbered ones run east and west. That is somewhat confusing at first. Usually on every other street, traffic flows in the same direction. But not always. Most street corners will show an arrow on a building at the corner, indicating which direction traffic flows. Sometimes the arrow is double-headed indicating that traffic is two-way for that street. Sometimes you will encounter someone driving the wrong way on a one-way street. Pull to the side, smile and let him through.
From Cancun, Merida or Chetumal
From the Toll Road (Quota):
From the Cancun-Merida toll road and from all points north such as Tizimin, take the Valladolid exit from the toll road and continue into town, make a left turn four blocks past the cathedral located on the main square (the zocalo). Currently there is a yellow computer shop on the far left-hand corner. It is a good reference point. Make a left turn to a very short half-block to the Parque San Juan, make a right as you enter the square and the Casa Hamaca is directly in front of you at the far end of the park.
From the Free Road (Libre):
From the free road from either Merida (Chichen Itza) direction or Cancun, turn south at either the main square or the cathedral (depending from which direction you enter town) and follow the above directions.
From the South:
From Felipe Carrillo Puerto, Chetumal, Belize and other points south, enter the city of Valladolid, cross the railroad tracks and make the third left turn at the Parque San Juan. Casa Hamaca is at the far end of the Parque (a very short half-block).
Use caution and common sense when using ANY road map of the Yucatan unless you have drawn the map yourself within the past few months! Almost every map that I have seen shows roads where there are none (especially since Hurricane Gilberto) and does not show other, existing roads...some of which are new and some of which are probably scores of years old. Use Mapquest and Google Maps in addition to paper maps. GPS systems are now quite accurate for the Yucatan. Most Google Earth imagery for the Yucatan is over six years old.