[Darkman]

Spoiler regarding hidden items in the early parts of the game (Ring of Protection +1, a gem, and a wand of frost)
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In the Crossroads area, not the one where you find Imoen but the one just east of it where you talk to the wizard in the pointy hat, there is a Ring of Protection +1 hidden under a rock about one screen north of the three-way intersection.

Also, there is a pricey gem hidden in a tree on the map with Imoen near the area where you pick up Montaron and Xzar. I can't remember the exact location, but it's at a point where the road runs vertically and it's in a tree that grows at the edge of the left-hand side of the road. Look about halfway up the tree stump.

In the Nakshel Mines area there is a secret Wand of Frost in the very top left of the map, above and to the left of the mining pits at the very edge of the map.

Have fun!