This article discusses the possibility of humans being able to make their first footprints on one of Mar's moons, Phobos or Deimos, within the next 10 years. "They are the most accessible planetary bodies in our solar system. It's counterintuitive, but they're even easier to get to than Earth's Moon, for a robotic mission" said Pascal Lee of the Mars Institute.
Mar's moons are much smaller than Earth's moon, making their gravitational pull much less than Mars, so landing on them would be like docking with another spaceship, which makes the trip less expensive. Lee estimates that a trip to Earth's moon would cost $200-300 billion while a trip to Phobos or Deimos could be as low as $30 billion.
http://space.newscientist.com/article/dn12898-marss-tiny-moons--one-small-step-for-mankind.html
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