There are plenty of areas outside of Bayjin and Mtn Wilderness (like the swamp, s.e. wildereness, wilderness clearing, nime tunnels, lower marten's bluff, marten's bluff, the many levels of Trynton, Umpani compound and caves, the retro dungeons ...)And if an area if too hard, you may still want to pass through it, avoiding battles, to find good loot (like S.E. Wilderness).
Tools for Wizardry(r) 7