Just head north in this room and go up the staircase you see. The next room is just a path through a giant pool of water. Watch out for the birds that swoop down on you. They can spit feathers out and they're difficult to hit because they fly around your head. Wait till they come down to hit you, then do a jump/hit to destory them. The exit is in the upper left of this room.
Once you're back outside, climb up the vine to the right, climb down the next one, climb back up the third vine, and you'll come across a doorway. Head north to the next exit, from there go west down the corridor, and go through the doorway. You'll wind up in a room with two rocks blocking the path to a treasure chest. Once you touch the rocks that are in the way, they'll transform into the rock monsters. Destroy the two monsters and get the treasure. Ark now has the RocSpear, which will allow him to destroy large boulders. You can practice using the RocSpear on the boulder that fell from the ceiling and is now blocking the door. Just equip the RocSpear and hit the boulder. It should explode. Now just head back the same way you came until you get to the room with the two ramps. This time you can go up the staircase.
Dont worry about getting over to the right side of the room yet. There is a large gap separating the left and right sides of the room, and you can't jump it. Instead jump over the gaps that are in the floor on the left side of the room and exit back to the outside. Once you're back outside head east and then climb up the vine that you'll come across. There is a MagiRock on this level, so grab it and then go through the doorway that you see.
Follow the path through this room and you'll get to a group of 4 rocks that are blocking your way. Just use the RocSpear to destory them and continue moving south through the room and back outside. From here you have to jump up the cliff ledges and walk west. Continue walking west and jump down more cliff ledges until you get to a hole in the ground. You can climb down the vine leading into the hole, or you can climb down the vine just south of the hole and grab a MagiRock.
Once you start falling down the hole, there are two paths you can take, right or left. You can lean toward the right and you'll land on the ledge with the MagiRock on it again. You'd have to climb back up the vine and then climb back down the hole and this time lean left. Or you can just lean left to begin with and not have to worry about climbing back down the hole.
When you land, travel west and pick up an SBulb. You'll also come across another hole with a vine leading down. Go down the vine and fall out the other end.
From your landing point head west (you'll go east later). Walk down the long path and you'll eventually come to a doorway. Enter the door. Ark will be in a room with some small holes in the floor. Rock heads pop up from the holes, spit fire at you, then pop back down. And the little boogers won't pop up if you're waiting by the hole to destroy them. Walk away just a bit so they'll show up, and then do a dash/attack combo to destroy them. From here enter the doorway in the upper right corner of the room.
In the next room, you have to dash across the stone bridges before they fall down. Waiting on the other side of the bridges are Quakers. You can dash across the bridge, and then do a dash/attack combo to destroy them before they leap/land, cause and earthquake, and make you not be able to move while you're on the falling bridge.
Ark hears a voice saying that it has waited a long time for his arrival. All the birds that have turned into monsters will now be normal again. The scene changes and now you're back at the Sanctuary. There's birds everywhere now!