I've got 220,000 miles that I've got to burn before the spring of 2012. I've recently begun to think about how I want to use them and I'm thinking that next year I'll take a trip around the world for maybe (2) months, stopping in "x" number of countries to climb some peaks (mostly class 4 stuff). The two limitations that I can think of are that the summits would need to be somewhat close to larger cities with international airports and couldn't be too high (below 16,000 feet) as I couldn't spend too much time on a mountain acclimating. I thought I'd throw this out there and see what routes members would take if they were in this situation.
Also, this airline got me for 60,000 miles (I let them expire unknowingly) several years ago, so I really want to use these.