I can vouch for the beast tribe quests, particularly the Kojin quests if you're that far. They offer some really good experience for hardly any effort. Doing them with a level 70 job also yields a handful of Mendacity tomestones each in place of experience, if I'm not mistaken, which can save you a little hassle trying to meet the weekly cap. Not sure yet how good the Ananta quests are, but based on what I've heard they're not too shabby either. I'll also use the free time to occasionally check my GC squadron and get them started on some training/send them on a mission if one's available still for the week.