The camshaft position sensor (CMP sensor) on a 2000 Dodge Dakota 5.9L (Magnum engine) is located on the
passenger side (right side) of the engine, near the front of the cylinder head. It's typically mounted in the valley between the cylinder heads, but its exact position might vary slightly depending on the specific engine configuration. You'll likely see a connector plugged into it. It's a relatively small sensor.
To be absolutely certain, you should consult a repair manual specific to your 2000 Dodge Dakota 5.9L. A diagram in the manual will show the exact location and will be far more reliable than a general description. You can usually find these manuals online (in PDF format) or at auto parts stores.