QUESTION: 
What area of Mars would you be specifically looking for life?

ANSWER from Jack Farmer on November 20, 1996:
If we are talking about living organisms, we will need to go into the
subsurface to depths of hundreds of meters probably. That's the only place
where liquid water is likely to be present today. If we are talking about
past life, then we need to find water-deposited sediments in some of the
old terrains of Mars.