[Overview]
Secret 1 - Secret Area
On the far left of the first open area, find this secret cave.

Secret 2 - Secret Item
Paulo and ironwoode found this one. Here's the description from Paulo: Go thru the valley till you arrive at the lava area. Look on the wall to your right, you'll see what seems to be a snake or an S written in stone. BLAST IT :) You'll get tons of +5 health bonuses.
Thanks! And here's the screenshot:

It worked well for me to first open all the beam poles except the first (need four rockets each to open) and to finally open the first one. This way, the big kleer will not close the ones you've opened so far.
Created October 30, 2005 Peter Holzwarth.