One comment I have about Hallow's End: the Trick or Treat questline pays a *lot* of XP. One of my teams is still in the low eighties and I've gotten about a bar-and-a-half just Trick or Treating, and I still have Northrend and Cataclysm areas to go. Cheap, quick XP.

Plus, because I leveled 10-80 through dungeons I didn't have any flight paths so visiting all the inns is helping me learn all the flight paths in case I want to go for the Explorer achievement or level up some Archaeology in the future.