Simple but it really gets the job done on setting the atmosphere. That was mesmerizing to listen the whole way through.
I think the waves and giggling sound effects can be lowered down a bit, and maybe with a bit more reverb so it will sit better in the mix. Or you can automate the gain/volume so that they get louder in certain part of the tracks and then softer in other, letting the piano and other instruments to shine through to create an "ebb and flow" feel .
But this is just my opinion haha. Great job overall! Looking forward to hearing your future projects!