Dick Dale era surf guitar (someone else mentioned this as well, adding the best artist name). Dick Dale also did a cover of Claude Debussy's "The Aquarium" which is the sound track for Space Mountain at Disneyland/World. So either or both, and there might be other covers of "The Aquarium" out there if the original isn't too slow.

Going more ocean-themed....

Aquabats or Tsunami Bomb for some early 2000s punk/ska that isn't ocean-themed but the bands are kinda.

Tide is High - Blondie

Scuba Diver - King Kong (it's a weird song, but hypnotic)

Where is My Mind - Pixies (about fish, but close enough)

Beyond the Sea by Bobby Darin

Maybe more sailing themed, but that's close, right?

Brandy by Looking Glass

My Heart Will Go On - there's a Dragonforce metal cover of this if you've been traumatized by the pennywhistle.

Come Sail Away - Styx