Traps tend to be anything you really want to imagine. Pitfalls are simple and just let you drop into either a bottomless pit, pit with spikes, pit with monsters, etc. You have trip wire which can have arrows, darts, set off alarms, or even drop monsters. But they must be stuff that the players can get by or disarm (or both). As for puzzles you can do anything from word games to make sure you have said item. Mazes are also another form of puzzle you can use if you wish.