60-62: quests and ramparts
62-63: zangarmarsh 2 hours questing
63-64: weirdest moment for me: got a mixture of 2nd half zangarmarsh quests with some terrokar.
64-66: blood furnace. a lot. Mixing with Nagrand.
66-68: finished nagrand, tried mana tombs, but 2nd boss was just too gay. went BEM.
68-70: BEM a little, did the elite quests, moved on to netherstorm, manaforges quests plus the little village lovely questing. At this point i was almost 69, while doing lots of sethekk halls runs. Went to SMV to complete some elite quests, as well as changing scenario a bit. Ended up dinging in sethekk halls.

It all about what u can handle, and how bad u want to get 70. mix between quests and instances, or just instances if u can drink red bull and smoke all night.