Talk to the bandit chief of Harbour Town
A minimum of four quests completed for the bandits will allow to ask one of them for their boss' whereabouts. Head to Sonya's (M2.41) brothel and pay her for giving you the information about Scordo. You have to press the button behind the painting on the left to get to the corridor where the bandit is hiding. Scordo will give us a package for Don Esteban (M3.23) and a key to the door at the end of the corridor - a secret passage out of the town.
Find the three golden bowls (M/B)
Carasco (M2.29) orders you to find three golden bowls on the black market. In the tavern you will find Dytar (M2.26) who will try to sell one of them for 150 coins. If you don't know how to steal, buying it is your only option. Dirk (M2.17) has the next one; you can get it in the same way as the one before. The third brother - Olf (M2.54) is at Hernandez's (M2.51). Instead of paying him for the information on where he has hidden the artifact, just head to Jack's lighthouse (M2.44).
Go inside (1st floor) and pick up the telekinesis scroll lying behind the barrel. Look inside and use the spell on the golden bowl. Give the artifacts to Scordo to make an impression on the marshes people (see Talk to the bandit chief of Harbour Town), in the other case (favour for the mages) head to Carasco (M2.29). After completing the task you should talk to Hernandez (M2.51) who will free Olf (M2.54). If you found the secret town exit and completed the A gathering of triplets task you can now take the three brothers through the tunnel leading out of the town.
Cid's wife - Keyleight (M2.21) is in possession of Nelson's (M2.19) ring. You can either rob her, bring something "better", like a necklace from the locked chest marked on the map (3 lockpicking level) or just kill her (however Cid (M2.20) will get quite mad about it). If Cid has left (Find the burglar's spy! in favour of the mages), the only thing left is to beat her up. Nelson will let you keep the ring.
Skins for meat
Flavio (M2.12) orders you to find 5 wolfskins and 5 wild boarskins. You will find them in the houses marked on the map (white - boar, black - wolf). Sometimes they're just in plain sight, sometimes hidden in chests. Cole (M2.15) will give you one wolfskin. It's worth to learn how to sneak. It will help you in getting the other skins.
One of the skins can be found on the roof above Finn (M2.10). Mo (M2.37) will give you two boarskins and one wolfskin. Once you're done collecting them, head to Baxter (M2.38), who will give you some meat which you have to take to Belschwur (M2.11). In return Flavio (M2.12) will give you two healing potions.
Protection money from Josh
If you haven't visited the Monastery yet, Delgado (M2.3) will order you to collect debts from Josh, after completing the Protection money from Costa quest. You have to head to the tavern and ask for the money. If you don't want to hear about the deal between Josh (M2.18) and Delgado, just take the money. Otherwise accept to pay the debt in return for the gossip that Josh heard.
This quest is a consequence of Protection money from Josh and Josh's (M2.18) gossip. In Jack's lighthouse (M2.44), on the ground floor, behind the barrels you can find Jack's key (it's invisible). It fits into his chest on the upper floor.
Patty wants to leave town
After finishing The lost father quest, Patty (M2.25) will be searching for a way to get out of town. Completing either Where are the artifacts disappearing to? or Talk to the bandit chief of Harbour Town will result in discovering a hidden passage out of town which will allow you to finish this quest. After exiting the town, Patty will stay on the beach and you won't be able to talk with her until the next chapter of the adventure.