Well, on the serious side, Mars is one harsh mistress! Just talk to any of our finest solders that drove through the desert to take Bagdad this past year about the sand and what it does to every piece of machinery. I imagine some of the dust storms that kick up would be like a commercial sized sand blaster! then you get to deal with radiation, heat, cold and oops watch out for that ravine we missed on our super duper telescope pics.
Now if it is those extra large breasted amazon alien women, then I will volunteer to be the ambasador for earth!