Besides the obvious gathering resources and rare (elite) mobs, what else would give you guys an incentive to keep exploring the world and have fun doing so?
Personally, I can think of a few such things that I would like to see in the game
1) First on my list is one brilliant thing which an otherwise trash mmo-rpg did that I loved. The metin stones of Metin 2.

Weird meteors that would drop randomly in each map. With a high hp pool they would drop pretty good loot when destroyed. The thing is, when attacked, they would summon all sorts of mobs (usually related to the nature of the map) to defend them.
Why I think these were great?
Because it made players want to roam around the zones all the time. The world was always alive, both in pve and pvp.
And overall, I think it was a more versatile and interesting system than simply a more powerful mob.
How could AoC implement this system?
Can think of many ways.
Have abandoned, large, transport crates that are ''cursed'' or oozing weird chemicals making nearby mobs go crazy and swarm people trying to break the crate or stuff like that.

Would be a cool thing, a cool event to have there in the world for people to know that whenever they run around for whatever reason, they could find one and get the chance at great loot.
2) Second on my list is the Dark Souls crystal lizards.

Small creatures with no offensive abilities that drop good loot. Whats the catch? When starteled, they run in a random direction and disappear if not killed fast enough.
I'd like to see something like this in AoC. A loot chest which you need to chase while risking ugly mob pulls and other enviromental dangers, for the chance of good loot.
Maybe have higher lvl ones require notable amounts of cc/an ambush/either way serious group planning to catch?
Maybe have higher lvl ones like that spawn in the middle of boss fights or sieges or stuff like that for some added flavor?
3) Okay, now, this is a classic, the loot chests from World of Warcraft plus mimics being out there in the world.

Whats in this cavern? Who knows, maybe it's a chest, lets go see.
Whats in this ruin? Who knows, maybe its a chest, lets go see.
Whats in that sunken ship? Who knows, maybe its a chest, lets go see.
Yeah, trasure chest are great. This game is going to have quite the pirate theme to it so please, let's go.
Just give it more risk and put actual traps and a chance of encountering a mimic (elite mob), for the added adventrue flavor.
So yeah, what kind of such incentive would make you guys have fun running around the world all the time?
Something that would actually be fun and something you would look forward to every now and then, not something that would feel like a second job (like what Blizzard did).