When you load up the prehistoric mission (it was the second one I did after completing the pirate one) the first thing it will want you to do is locate the landscape gun, its the closest light beam to you. Then you will simply do the landscape edits for the random people scattered across the map. You can just look up to find their light beams to make it easier. Complete these tasks for the gold blocks, return them to your space ship and your done. Very easy to do and is really a tutorial level.