I've been playing quite some Gothic 3 lately (german action-RPG, just in case someone doesn't know).
There's this interesting mechanic to reward exploration. Well, it's probably not highly innovative, but whatever.
Anyways. There are these chests (dubbed "Quest Chests" by the community). Say, there are 40 of these quest chests in the game.
Instead of the loot being tied to the location of the chest (for example, the super deadly sword of doom in a chest in the super deadly caverns of doom) [or just being random altogether], it is tied to the amount of quest chests opened previously. So, the first one you open always contains a "shiny dagger", the second one a "kinda nice bow", the 30th one always the "super deadly sword of doom".
So, anyways, these chests are somewhat scattered over all the world, and the items from the "higher" quest chests (for example 35th and higher) is exclusive, and kinda powerful.
(Actually, in Gothic there are two sets of these quest chests, one for weapons, one for magic stuff, like staffs, amulets, scrolls...)
(Also, it is mixed with standard random and fixed chests)
(Also, in Gothic, no one tells you these chests exist. The community found out on it's own :3)
So, just telling you, ville, you might consider it (or a derivate of it), if there'll be exploration in Driftmoon :3