I discovered this yesterday and thought that it looked quite good.
"The Bootleggers Guide to Africa is a virtual air race consisting of ten (10) adventure-based flights ("stages" in BOTA-speak), which pilots complete in as short a time as possible"
It is completed offline with specially provided software calculating your time and giving you waypoints etc.
Although it is a race, there are still very strict rules on such things as taxi speeds, rough landings and overspeed. In other words, you are still expected to fly the plane in a safe manner.
The race can be entered by single pilots on their own or by VA's. Take a look and see what you think. I know I'll be taking part!
http://www.battleoftheairlines.org/