Playing in the dirt

We are wanting to start the new addition to our house but we have SO much dirt to move first. You can see the progress from the bottom picture to the top picture with Simon sitting on top of the hill. All of that dirt still has to go so it is a slow process. Once we get all of the dirt out to the tree line than we will come up with either a retaining wall or a drainage system. We are leaning towards some sort of french drain that channels the water into a storage container so we can use the water for our garden.