First go to RockBreakers Last Gas and take care of all the Enclave. Next look up towards the cliff and you will see a shack on top. Climb up the hill and enter the shack. Right to the right of the door there are two radroaches in a cage with pet names so thats pretty cool. In the locker in the back there is a sniper rifle called the Victory Rifle. It deals a great deal of damage and is the best rifle in the game so I highly recommend it. You need a lockpick of 100 to get in it
Do it. Its gets really addicting trying to find all the better weapons and armor. Then once you have them all/most, trust me, you want to change it to Very Hard. Otherwise the game is way less fun.