Happy Early Birthday! I hope you have a great weekend.
@MeganB is right, it is great for cleansing & I agree with @JoeyP that beach walks can have some wonderful gifts from the ocean. I also collect sand & ocean water from my area to keep at home & different shells & things… sea glass, sand dollar shells…
As for harnessing its energy, a lot of that would be working with water or the water element, but the ocean energy would really depend on how it’s reacting that day based on the weather & other natural forces. The water is going to react to what it’s being exposed to. So if it’s stormy or windy & choppy seas, it’s going to have more intense energy than a regular day at the ocean.
- I also don’t know the area, I am on the complete opposite side of you by the Atlantic Ocean in the Northeast of the United States so our seas can change throughout the day.
We do have an Ocean’s Charm Spell for luck & money. We have also had an 
Weekly Witchy CHALLENGE - Of Seas, Sands, and Tides, an entry to ocean challenges I Love the Ocean Challenge Entry, & an entry that has crystals Crystals & Fairies (Ocean Magick Challenge) 
Weekly Witchy CHALLENGE - Of the Element Water may help with ways to work with the water element & incorporate ocean water with it too.