Welp, Friday night I spent several hours debating over nice spots to set up camp (to rotate characters in and out over the weekend). Mech Guardian, while awesome xp, doesn't really lend itself to that given the floor arrangement. But I spent six hours there rolling up about 90 AA all told (across 6 characters).
For the rest of the weekend, I alternated between Plane of Earth (for the low 70s), treants in Loping Plains (for the mid 70s), and Mech Guardian (for the 80-ish). It was odd, really. Those of my characters who loaded up on XP potions (from the orcs in Ro/Commons way back when, ceremonial elixir, etc) got tons of AA while the others (due to recent account splits, I have several characters who don't have lesson) got it at a nice clip but nothing spectacular.
If I wasn't such a stick in the mud, I would've done Dains since those were giving ridiculous xp I hear, even for MMs.
I also got a chance to check out Direwind. Man, my Paladin loves her some fleshstitch golems and carrionmancers.
I also found the increased activity led to increased competition in bazaar so I have a nice cache of stuff I bought well below (Fennin) market value that I'll resell over the next month or so.