Here is a nice site, with topgraphical data of Mars surface
http://marsoweb.nas.nasa.gov/landingsites/index.htmlIn My opinion, being able to see, or colonisie 'well known' areas such as Mons olympus, or the great canyons, or even the face of mars! Would be nice, but it would seem pointless to have the actual 1mx1m2 topography becouse we wouldnt be able to recognise the features (we havent seen with own eyes!).... but, simulating different 'known' surface features (example: deep sand, to steep to walk hills, un-passable jagged rocky areas, a deep crevass, sudden deadly drops) in different areas of the map- could give a good indication of what it is like to walk/drive on mars.
Gathering info of the mars suface features, to a human scale and trying to emulate the problems of getting to these areas (ie need to get to the bottom of crater, its too steep to walk or drive straight over, to rocky to walk a certain way, have to plan a route),..
Be interesting to have the option of 'death by wrong route taken' or rescue missions related to pepole getting lost or stuck in the inhospitable terrian.
As the demo stands now, I feel the topagraphical features (the hills and valleys) feel nice and 'realistic' add a few nasty crevasses and impassable rocky sections and the danger of exploration would be enhanced..
Maybe try contacting the russian mars team (example:http://ruspace.blogspot.com/2007/11/russian-mars-plans.html) or
http://www.esa.int/esaCP/index.html (european space agency doing some interesting stuff these days)...
I bet ESA would show some interest- they are allways trying to incorperate the public into there missions...