Rocket yard is pretty solid. Literally just run on the outside of the map in a huge circle. Put on a ghost that reveals spinmetal location. Also, do this by yourself or with a nightstalker hunter friend. If alone, turn the sfx volume all the way up and listen closely for the shimmering sound of the chests (since the ghost can't locate them). If on a warlock, use Voidwalker with max agility and blink to move around faster. If hunter you should be using keen scout, and extra material ghost. If titan just skate, twilight garrison will help + shoulder charge. Also Mida multitool for greater movement speed. [spoiler]Once you get used to almost all spawn locations, it becomes fairly easy.[/spoiler]