Ark: Survival Evolved is finally releasing this August, but if you can't wait for that, you can pick up its first sponsored mod now in the form of Ragnarok, which is available on Steam.
If you're interested in hanging on for dear life in-game, check out our list of the PC's best survival games.
Ragnarok is a massive new expansion with an enormous map with cold mountains and even an active volcano, with caves, tons of land to explore, and several other features. For instance, resources like sticks and carrots will be available to harvest, there are hot springs that you can utilize as a buff (but be careful, because they can kill you too.)
Find the whole list of what Ragnarok offers here. It's an impressive list of features, and it's an interesting riff on utilizing what's currently in Ark: Survival Evolved to create something different.
You can grab Ragnarok right now on Steam if you're interested in jumping right in.