A Favor for a Friend
Prerequisite: Complete "A Towerful of Mice." | Suggested Level: 6
After lifting the curse, you'll be asked to do another favor for Keira: she's expecting a delivery and wants you to check on it. Head to the marker to the north and use your Witcher Senses to follow some wagon tracks into the woods to the west. When you find the wagon, retrieve the package from underneath and return it to Keira.
Take her up on her other offers, and you'll wrap up this quest in style: racing to the meadow for a nice dinner. After some conversation, use your Witcher Senses again to follow a trail down to the water to find Keira - and a little something else…
For the Advancement of Learning
Prerequisite: Complete "A Favor for a Friend." | Suggested Level: 8
After your 'special time' with Keira, you'll wake up near Fyke Isle. Head to the tower marked on your map to confront Keira there. Yes, this whole series of quests can end with you fighting the woman you just slept with. Convince her otherwise, or defeat her to wrap this one up.
Prerequisite: None | Suggested Level: 4
Directly south of Fyke Isle is a smaller island with an Undiscovered Location, a Hidden Treasure. Swim there and loot the corpse for some blood-soaked notes, then read them to learn of a sunken treasure nearby. Dive into the water and swim down in the marked area to the east to find some loot.
A Greedy God
Prerequisite: Complete "Wandering in the Dark." | Suggested Level: 7
South of the Wastrel Manor marker, you can find a man named Dagmar with a quest for you: he and his pal need help appeasing the Allgod. Agree to help, then search for an illusion in the structure and use your Eye of Nehaleni to remove it. Head down the staircase this reveals to meet the Allgod himself. You can either convince him to accept the offerings or kill him. Either way, return to Dagmar after the deed is done to complete the quest.