Currently we have a number of city-based kits best suited for coastal artwork, such as Arch Vogue, Neo Dubai or Industrial. What we don't have, however, is structures with naval themes.
What I propose is one kit (maybe more) that could supplment these, to make scenes with a commercial presence on shore. I have lots of ideas, but I think a good kit to start would be either:
1) Marina/pier greebles with some small boats, a few new storefront buildings, and rides.
2) Commercial Fishing Port for offloading, processing and packing fish. For this, seawall/breakwater pieces would be a welcome addition.
3) A "boneyard" (dead ship hulls) like those in the Aral Sea.