Since you aren't restricted to kiting as a monk, I would try to dungeon as much as possible. ZEMs are amazing when you can utilize them. Sorry, but I don't have any specific ideas for which dungeons to go to for soloing, although MM is a typical dungeon for the 30s crowd to hang out in.

Unless you have a fungi tunic, I wouldn't recommend the Sythrax cave at 31. I tried at that level, having pretty good gear (generally in the FBSS, Jade Mace, HBC category) and they just hit too hard. Between fairly high melee output and contant 30dmg procs, they'd do way too much damage for it to be efficient grinding. If you have to sit and regenerate health the natural way after each kill, it'll be shitty leveling. Stick to very low blues where you can generally sustain yourself on bind wounds and mend without having to rest for several minutes all the time.

I can't recommend most dungeons either. Caster mobs are too overpowered, especially for a class that has literally no way of interrupting spells at all. You really want a place with only melee mobs, and preferably where you won't have to feign split them. Even though the class can do it, it ruins your leveling efficiency, especially at these levels where FD still fails regularly. If you don't want to run around in an outdoor zone looking for wandering mobs, you might try Unrest. There's a nice room downstairs with mobs in little alcoves around a kind of sacrificial thingy. Maybe Highkeep guards, I can't remember exactly when they're grindable.

The HK guards range in level from 25-30 (a few low 20s, a bunch are 25ish), so they might be really good.