We had a weekly challenge on ocean magick - 
Weekly Witchy CHALLENGE - Of Seas, Sands, and Tides that may have some ideas for you!
I live near the ocean & have trouble being away for it or living in a landlocked state. I connect heavily to water & have been working on my connection to the other elements.
I also found an article on Otherworldly Oracle about being a Sea Witch that may interest you. We do have a good amount of witches that work with the sea/ocean 
/ water 
so there may be some other ideas for you contained within the forum or site also.
From Spells8 & a very quick search I found this also which was really interesting to me being so connected to water…