Free XP at Level 77

In Wrath of the Lich King level 77 is a huge stepping stone for many players. The reason (which still pisses me off) is Cold Weather Flying. Since for me it is such a joy to be able to ride my epic flying mount, I usually celebrate this by flying around some of the zones. Inevitably I also gain some XP from exploration. So I figured since that XP will be lost if I become 80, why not discover all of Northrend's areas by just flying around?

Fly around I did. Now I admit, I could have probably made more XP just by questing, because it took me around 1 hour to discover all the areas that give the respective achievements but on the other hand it's a safe and free method to get some extra XP that you ain't gonna see anyway if you hit 80 and leave all these areas unexplored.

As an added bonus, if you discover all of Outland you get a nice Tabard of the Explorer in the mail.