I refurbished this page using the boilerplate using information from ingame and already stated information. I would like to point out a change I have made:
These quests are stated as being in a chain, and I can say they definetly are not. When I first went to the Lighthouse, I was given all three quests at the same time, so obtaining one is not dependant on the completion of another. For those who contest this, I have taken a screenshot here showing that although I have not handed in, or even completed, The Coast Isn't Clear I have been given, and already completed The Coastal Menace.