I'm planning an expedition for the summer or winter 2008. It has to be something challenging, but not insanely dangerous. I've been thinking about climbing Kilimanjaro or visiting a polar research station on Spitsbergen. It has to be suitable for a a male and female in mid 20s, moderately fit, but not used to extremes. The duration can be anywhere between a week and a month.
Any ideas where to go or what to do? Any great expeditions you've done and could recommend? Thanks very much in advance.