This is an awesome DLC that allows you to make legendary tools and weapons by obtaining a license and using that to craft a weapon or tool.
If you are going to purchase the Great Hunts DLC only activate the missions once you have completed your game play on the map you wish to play the Great Hunt Missions on.
Here’s why. On the Olympus map if you complete the 1st Great Hunts mission the Quarite creature will spawn in your desert regions.
Complete the 2nd Great Hunt Mission and the Quarite will spawn in everywhere on your olympus map.
This creature is a pain to deal with requiring time, weapon ammo and arrow drills. This is why I recommend to complete playing the map first so you do not need to deal with this creature.
This approach should be applied to all maps when completing the Great Hunts DLC.