If you have thought of a way of putting a man on Mars running circles around the rovers then please get into contact with NASA a.s.a.p. and enlighten them.
Human exploration is only feasible if the technology exists to make it possible. This was and is the case here on earth and obviously applies to exploration of the solar system as well.
Despite what the proponents of human space exploration claim, the technology to put a man on Mars in the foreseeable future does not exist. This article explains the difficulty of delivering a payload to the surface of Mars. The recent Ares launch test also demonstrates the lack of progress that has been made over the last half century in delivering a payload to space, a period that has seen the biggest technological advancement ever in history.
The case for human space exploration should be put to rest. As technology advances, robotic missions being so much simpler will always overshadow human missions when it comes to exploring and learning more about the solar system and universe.