Only Eagles Dare
Prerequisite: None | Suggested Level:12
Just southeast of Svorlag proper is an Undiscovered Location, a Hidden Treasure on a small jetty in the bay. Check here to find a corpse holding a key and a letter. Read the letter to learn about a nearby treasure, then hop into the water. Use your Witcher Senses to find a chest, and use the key from the corpse to get some sweet loot from inside it.
The Tower Outta Nowheres
Prerequisite: None | Suggested Level: 30
There's no Notice Board in Urialla Harbor, but you can overhear some folks talking near the fast travel marker to unlock this quest. Speak to the fisherman in the crowd to learn that a tower has randomly appeared on a nearby hill, causing storms in the area.
Head to your new marker at the tower (you may encounter a cyclops along the way). Go inside to find a portal, then step through to enter a separate, larger section of the tower. You'll have to fight a golem here, but after the clash, you can speak to a mage named Sigo. Apparently this tower has been teleported here, and he needs your help to get it back home.
Head to your next marker in the laboratory, and be aware that the tower will continually summon more monsters for you to fight as you navigate it. When you can, loot the key from the lockbox on the desk. Use this to enter the library as you move toward the next marker.
Use your Witcher Senses to find the grimoire you need, and be careful - once you pick it up, the room will fill with gas. Return this book to Sigo and he'll open the final chamber. As he starts deactivating the tower's spells, an earth elemental will appear. Defeat it and check in with Sigo to be teleported all the way back to Urialla Harbor. Swim to shore to check in with the townspeople and end the quest.
The Path of Warriors
Prerequisite: None | Suggested Level: 16
There's man by the Trail to Yngvar's Fang marker you can talk to about the island's "path of warriors." To complete the trial, you'll have to pass two trails full of obstacles. For the first test, follow the path, using jumps and ledge grabs - expect to fight some harpies too - to reach the highest peak on the island. Grab the token from the totem there to prove your worth.
Your next marker is a cave opening. Head there to start down the second path. You'll have to swim a very far distance in this cave, so be on the lookout for any place to catch your breath. When you reach the end of the water, you can loot another token from a submerged chest.
Prerequisite: None | Suggested Level: 12
This is found at the Undiscovered Location southeast of Urialla Isle. The Hidden Treasure here is a dead body; loot it and read the log you find to learn of treasure in the water nearby. Hop in and use your Witcher Senses to find the sweet loot.