Well I still have barely begun the main quest. I spent a lot of time exploring the eastern edge of the map which led me to a frozen area up in the mountains. I gathered that this bit was a DLC add-on because all the collectables are split into their own UI categories. I went in at level 30 and it was a very challenging area at first.. but now I'm probably way over-levelled for the rest of the game at level 56 with all the Banuk gear. But the Thunderjaws and Frost/FireClaws I took on up in the mountains were fun challenging battles.
Also, it really must be stated how good the snowy area effects are. The snowstorms, auroras, the way Aloy's chothes get covered in ice, etc... and I have never seen snow drifts work like this in a game before where everything can make tracks through it in real-time. Really incredible.
I finished everything I could do up in the mountains and ran my way back down. (I'd rather enjoy the world rather than fast-travel everywhere.) Still enjoying the game quite a bit.
