Writing: The Old Ways and Coastal Characters are probably my favorite. I really like how that whole panel really establishes the feel of the dangerous coast's culture and how people may act there. Conversely, I think the Coastal Adventures (which I'm taking to be suggested hooks) could stand to be reduced to 1-3 more fleshed out hooks, that dip more into suggestions for the Guide/"What's Really Happening". As is, it feels like each entry is what you would tell to your players; maybe just a line or two added to your favorite hooks (I like 1, 2, and 3 the most) would set up more scaffolding for the DM to fill in the details of the adventure's premise, and increase utility.
Purely from design accessibility: I struggled a little with the white font against a textured blue background-- a plaintext version for black and white printing would be rad. It looks great, don't get me wrong, but I have worse vision than the average person. The inside pages (page 2) are much easier for me to see; I think the brown boxes in the table really help. The back page (page 1, center) is the hardest for me to read against the blue gradient; I think you have the space to bump up the font size there or add a box. The white title text on the cover page is also tough for me to read, and a really quick fix for that could be adding black outlines to the white text itself. Not a box that would cover up your lovely setting sun image, but black outlines on the white letters themselves-- most programs should let you do this.
Nice work!