Above the gold door, you can jump across to a short corridor. Enter the 'goodie' rom at the end. Shoot the left wall, and more goodies show up.

On the way to the gold key, just after you could pop up for air, there is a secret door to the right of the big pipe. Shoot the wall, the door opens.

Sorry about the pic, it's a bit narrow there...

In this 'temple', two of the statues don't spring into life. Curious. How are they going to chase the pigeons away? Jump on top of the Quake lamp thingy in the middle. This teleports you to the ledge opposite. If you time it right, you can telefrag one of the dopes waiting there.