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The party notices a herd of deer grazing in a meadow amongst some rocks and bushes a couple fully visible but others partially visible beyond.  Something shiny glints amongst the rocks.
Upon examination it turns out the first couple of deer are drugged and staked to the ground, the other "deer" are many kobolds hidden in costumes, and the the glint is shiny junk meant to draw them in.

While walking under a large tree a rope ladder suddenly drops from above landing amongst the party (released from a high hidden location).  If a PC climbs it they find another ladder then another and can see a platform way above.  But as they climb the last ladder it is cut loose and they potentially take a damaging fall (maybe knocking PCs below then down as well if any more are making the climb).  Optionally after the fall, a number of angry bee hives are tossed down after them.

In a rugged section, the party finds a small navigable river and discovers a (poorly) concealed raft.  If they use it and travel down the river they soon reach an area with very steep banks and end up running a gauntlet as trees (already cut and prepared) begin falling on them from both sides accompanied by missile attacks.  They must negotiate the river as it becomes more treacherous (starts turning to rapids), while avoiding the crushing trees and dodging missiles.  Topping this off with a waterfall or having the river drop into an underground cave could be used to kick it up a notch.

Concealed Apiaries
The kobolds build clever thatched dummies with arms outstretched as if hailing someone. From a distance, they look like lost farmers. Really, they conceal hives of killer bees that surge out and attack anyone that gets close or that disturbs the nests. A Nature check (moderate DC) can help the PCs locate a special mud that when spread over their skin makes the PCs invisible to the bees, allowing them to harvest the kobold's honey.The kobolds, if they find out, will not be pleased. The honey has minor healing properties that will be effective in combating an outbreak of dire rat filth fever one town over.

Bear Baiting
The PCs find a trail that promises to lead to something of interest to them. Only it's a false trail laid down by the kobolds and it leads to the cave of a particularly nasty bear which attacks anyone that comes by. The kobolds have been unable to roust the bear out of their part of the forest and so they figure it's win-win for them - intruders get killed by the bear, the bear gets killed by the intruders, or hopefully, everyone kills everyone and the kobolds have a party while feasting on their bones. By the way, the bear is a druid's animal companion and he will be pissed if the PCs kill it.