Interesting to see that HKG has been mentioned by a few as a good MFU destination. Given the length of the flight (inc miles gained towards next MFU), and the hours of day (or night in this instance) this sits very near the top of my list.

But at the top of my list is South Africa. A great destination to take advantage of a flat bed on a long flight with only 2hrs time difference. Arrive refreshed, without jet lag and a pocket full of miles. Sounds good to me.