When choosing a landing site, we will have to take into account everything that is to be accomplished in Colony I. Geologists in particular would like to see the colony built in a region such as a crater, valley, or other land-cut. Unfortunatley these are the hardest areas to navigate a ship for landing. Another factor when choosing the landing site, would be the availability of water and other important resources. The colony must of course be self-sufficient, and therefore cannot rely on shipments from Earth. Even factories must not be over-used to produce water from regolith.
Location is everything.
NASA has not yet announced a landing site for the first manned mission to Mars.