Your visit at Hera's Harden will begin with a long cutscene.
After it ends, go straight. There's an experience chest there, two more can be found on the right. On the left there's a chest containing a Phoenix Feather [!!!].
Move in the camera's direction a bit and turn left. Hera's Chalice will be lying near the save point. Kratos will pick it up automatically, as you can't finish the game without it (this way you have gained all the Godly Possessions).
Move on, get rid of two stone statues and turn right. At the end of the straight road there's an experience chest. Backtrack a little and turn in the direction of the middle part of the garden. Go by the locked gate and eventually you'll arrive at a corridor [RS].
Inside of it you will be attacked by a new type of enemy - the Satyr. They're very dangerous, possibly the most troublesome in the game.
His attacks are mainly short ranged, but considering his speed and agility (he can even run on walls) he can quickly get near with an attack.
You should often block, focus on counter attacks and using L1 + Circle. A QTE symbol will never appear above him, but that doesn't mean you can't grab him. Most of the times you will have to tap Circle upon doing so, but if the enemy has been weakened with attack before, Kratos will perform a deadly attack with the enemy's own weapon.
Take a good look around the area at the end of the corridor, as you can find some hidden chests there.
Turn left to find an experience chest. On the right (next to the passage leading deeper into the garden), behind the hedge you will find two more experience chests and one hidden, containing a Gorgon Eye [!!!].
Upon arriving at the centre part of the location, be ready to sole the hardest puzzle in the game. There's a round button on the ground nearby. Stand on it and the camera will change perspective and show the environment from such a perspective that certain elements will sort of merge with each other and form a whole.
Use this opportunity to get to the passageway above you...
... and reach a gate. Open it, go down the ladder on the other side and move to the camera to discover another experience chest. Approach the pit which separates you from the further part of the location, jump over it and land onto the hidden spot on the left. There's a chest with a Minotaur Horn inside [!!!].
On the other side of the pit you will find a movable stairs part. Move it to the neighbouring "room" and place next to the goblet in the upper right corner (so that the water pours down the stairs and fills up the goblet).
This way you will open the door - go through it and watch the cutscene during which Hera dies.
After regaining control burn the nearby bushes (unveiling another goblet) and return to the movable stairs. Move them to the new goblet and leave there. For it to fill up with water, you need to stand on the perspective-changing button.
The next task will require the stairs once again. Move them near the button activating the green filter and place them as seen on the left screen (if you get to the right spot the game will inform you of it by a short camera move). Pick up the goddess' body, stand on the button and go up the newly made stairs onto the platform. Go near the edge and drop Hera's body into the last goblet.
Now you just need to push the stairs onto the switch and go along the long walkway to get out of the labyrinth.
You will eventually arrive at a pit. Call the Harpy by shooting it with the bow. Grab onto it and get to the other side, by changing Harpies a couple times, as the distance will be quite big.
On the other side you will find a couple chests, including one with experience and with a Gorgon Eye [!!!].
Move the nearby lever and open the entrance to yet another cave. Save the game before leaving this area.