self-explanatory. point out any hidden areas, breakable walls, and cool shit for all of us to find who are playing the game.
Theres a wall to the right that you can break.
..Ok, ok, I was being sarcastic. Allthough, you can pretty easily find a guide for this all, but, I guess Ill just post the easiest to describe "secret" I know of.
The wyvern, the first dragon you find, when you come across him on the bridge, run to the first little entrance, run down the stairs and get to a position where you can see his tail clearly, shoot the tail with about 30 arrows to get it to fall off then you get a drake sword. Enjoy.