You have to do Stealing Creations mini game, I heard it's like Castle Wars. But the armor only lasts 20 mins I think. I'm not so sure, I wasn't too interested in it when it first game out.
For training, I would switch around a lot, rock crabs (of course, like everyone said) then duel, DON'T DO BANDITS unless you have high defense. After dueling, just Yaks, Slayer monsters, Tzhaar monsters (if you can handle them) and then back to rock crabs. Thats what I use to do on my rune pure. Worked alright, kept me busy, and not bored. lol.