The Foothills is one of the main Location, after you leave the shuttle area. You'll need to jump here and there on different rocks to be able to progress further. You'll learn that tapping the jump button while in the air, gives you an additional jump boost with your jetpack, and also that you can move boulders (and other objects later in the game) by using the (x) or left mouse button. You'll want to move the boulder to the area under the cliff to be able to jump to it. You'll also find the waterfall, which you'll want to make your way up to and you can find a bed, which is perhaps an illusion. Make your way up the hill to enter a cutscene and therein discover The Town.