Larceny
Other people's things. The pay is good until somebody notices.
Pickpocketing
Market stalls
Only a stall with a banner over its wares is worth robbing. If its trader sees you, there is no loot — only a shout and a few dizzy moments.
Trapped chests
Open one and the trap springs. Search it for traps first (right-click): the better you are than the chest asks, the more often you disarm it. A failed search springs it all the same.