From what I can figure out, there are six main options for a typical Neverwinter play session. There are general PvE quests, skirmishes (think instanced public quests), zone-wide events, group dungeon runs, Foundry missions, and PvP fights. There's also playing the auction house, crafting, and making your own Foundry missions.
Yesterday was about the first two, so I decided that the second day would be all about the Foundry. At a certain level or part of the quest line (around level 11), you gain access to daily Foundry quests. These give you astral diamonds as incentive to run player-made content, so I figured I had nothing to lose and everything to gain!