It would be so lovely to have the sound of ocean waves and seagulls like one would expect. If you don't like looping background music, it is very hard to vibe in your garden when it sounds like you're about to be murdered in a horror film.
More tropical beach! Less Jason!
I'm by my Mist house. I've got BGM off and Ambient turned all the way up. I'm hearing waves and seagulls (though the seagulls are faint and infrequent). Since my house is right by the beach I moved throughout the ward but it's pretty consistent regardless of what part of the ward I'm in - unless I'm passing by a house with a noisy outdoor furnishing.
Could it be a furnishing you or a neighbor placed that's the source of what you're hearing?
I loop the wind chimes in my Mist apt and only hear them and the sounds of waves and gulls. That is "inside" only though :)