The "X's" on the map that came with the game. The little red ones. Do those signify treasure or secret keeps and holds? Cuz I just investigated the one up near Windhelm (near lake yorgrim) and only found a bandit hideout. What say you?

They're locations of treasure chests, I've heard.

The two x's that I bothered to see about corresponded to treasure chests.

They're dragon-related.

You'd be better off asking this in the spoilers forum, just saying.

Alrght I'll try my luck there