Before entering the hallway, use the jump pad left to it to get to the roof of the entrance. Collect the sniper ammo and the health.
When exiting the cave, turn 180° and blow the rock right to the cave exit. This frees an invulnerability power up. Before taking it, you may first want to run around a bit to spawn some dozens of enemies to increase the efficiency of this power-up. Blowing this rock should also make a serious damage apper somewhere in the level. Having played around with the level editor a bit, I'm now pretty sure that it was forgotten to be placed on the level. Let's wait for the first patch and then try again.
The right temple has a secret door on it's right side. Blast it and get the minigun.
Following the valley after the right temple, you'll get a secret armor. Then, step aside and let the boulder pass....
Thanks to Philip Gray: In the left temple, in the room after the spike trap and before the room with the golden jaguar, in the last spot on the left, find the jump pad that gets you on top of the scaffold. There's some riffle ammo and the armor.
Follow the valley to the left of the left temple and find Crollywood. No stuff, just a secret place.
On the right back side of the middle and final temple of the valley, you'll get a secret health.
In the left house besides the final temple, you'll get some ammo.
Created 27.1.2002 Peter Holzwarth.