[PointyHairedJedi]

I would, on my own, go and see the sheild volcanoes of the Tharsis region of Mars. Hocking a loogie off the side of Olympus Mons (or indeed any of the three other volcanoes) would be problematic though - aside from the deadly atmosphere, pretty thin though it would be at that altitude, the shape of the volcano itself (basically a dome of rock) means I'd have to get a pretty respectible velocity going on said loogie if it were to have any chance of clearing Olympus Mons and reaching the ground below, even in Martian gravity. Of course, while I was over there I'd probably take the oppertunity to see Argyre and Elysium too, as it's probably not the sort of holiday I'd be able to afford too often.