Quests from: Elder Marne (2), Gera (3), Juni (4), Mozah (5)
Talk to all 4 quest-givers (the quest Ship Sabotage is obligatory, the rest are side-quests, but they can be easily completed all at once) and agree to help them, then head North, to Shandraís farm. Talk to Shandra and sheíll tell you to go to Highcliff Castle. Do so.
The first person youíll see around here will be William (1). As it turns out, he escaped his wife Juni deliberately and doesnít want to go back. You can solve this in a few ways, but the reward will always be the same. Do as you will, convince him to go back or lie to Juni that he was killed or anything.
Next, find the two kids, Alex and Andrew (2). Defeat the wolves surrounding them and talk to them. You can agree to lie to their parents or rebuke them. It doesnít matter when it comes to rewards.
Head to the castle. Youíll see a lizard named Slaan (3) in there whoís fighting the undead. Help him defeat them and heíll propose a deal: you help him find the missing kin (lost somewhere around the ruins) and heíll take you to his chief. There is another way of solving this, you can just kill him and take the lizardfolk hideout map off him. The second solution is more evil of course. Weíll go through both of them.
If you decide to kill Slaan, youíll see a message on your screen saying that youíve found the Lizardfolk Lair map. Go there. Slash through the guards to the cave entrance.
Inside, you have to reach the chieftainís chambers (1). Along the way itís good to grab a chest (2) and get a cool weapon (One of Many) from it. The chief is a tough opponent, as heís got a lot of bodyguards near him. Youíll get a few cool magical items from him, though. Check out the vault (3) and leave the area using the shortcut (4). Go back to Highcliff and tell Mayne about your deed. The ship will be ready for you.
HINT: Skipping the castle ruins makes it impossible to complete Mozahís Backpay.
The second, more interesting way of completing this quests leads through the castle ruins. Agree to help Slaan find his folk and go down to the dungeon (4 on Highcliff Castle map). Go along the main corridor and youíll see a cut-scene with another shadow priest (1). You have to fight him. Just as before, focus your attacks on the priest himself, ignoring his undead soldiers. Notice that the zombies around here are Undead Adventurers, apparently the ones that Mozah wanted you to find. When you kill them all, search the bodies and take all the items (especially Mozahís Backpay).
Besides that, thereís not much to find around here, but nonetheless take your time to search the whole level. The warriors you are looking for are at (2). Talk to them and tell them that you just want to talk with their chief. When youíre there, try to negotiate (it doesnít take any special skill to succeed in that) or just kill everyone around. The latter pays off very well (you get items for completing both ways in this quest), but is extremely difficult. When the fight breaks out, youíre standing in the middle of the room thatís practically filled with enemies. If you feel confident in your abilities, go ahead and try. If not, try the peaceful solution.
When youíre back to Highcliff, it will be time to gather rewards for the quests you completed. You can give the 500GP you found to Mozah or lie that you werenít able to find it (your reward would be 150 GP if you gave the gold back). Tell Juni about William (truth or lies). Talk to Gera and Zachan and youíll get their family amulet for finding their kids. Last but not least, talk to Mayne. If you decided to negotiate with the lizards, youíll also have to convince him that itís the right thing. If you succeed, heíll ready the ship to Neverwinter for you.