Ok, this level is quite short, but then again you have an awesome bike to play with, so it is pretty cool in a way.
Just drive a bit until you get at some ruins. Get off the bike and prepare for a bit of jumping.
Use the pillar to reach the ledge ahead. use that to get to ceiling of the building.
Break a jar and pick up the artifact hiding inside.
Get inside the room and pick up the weird square item. You'll need it at the next level to use the calendar wheel.
The tricky part is how to get out. You need to do a bit of chimney jumping.
Another artifact is waiting for you as you get up.
When you are out a panther will try to kill you .. get rid of it and move on (on the bike).
You will need to jump over a pit and avoid another one (there's a side road around it on the left side). Get off the bike when you reach the next ruins.
Get inside and get ready for the next level. Yeah, it's going to be faaaaaar longer.