Halo used to have forge, and even when I wasn't building things in these maps I loved adventuring through them. With Destiny I feel even more attached because these places, they could exist(being that it's based off of our inner Solar System and if you used a little imagination you could see these places and things existing.). Now adding this as a separate aspect to the game you could just rework the multiplayer maps into the game by making them kind of like the Mercury map, but extend the size a bit and add surprises hidden into these "adventure mode" versions of the multiplayer maps(imagine Traveling from the Twilight Gap map to the new Frontier map, just adventuring through these places killing PvE bots. Traveling over to the abandoned Tower and exploring it's contents. Or as a probably much requested, being able to go into the Guardians living quarters or down into the city. I don't know, just sounds decently exciting, right?). Could you maybe think about adding these things. More things to do for everyone right?