Occams razor is she was raped/killed during drugs/rough sex on the beach and disposed of. But that's difficult to do without a trace. What's your take?
My take is that we were supposed to think the crime took place on the beach. It was a wild goose chase. Occams razor is that the perp committed the crime at his private apt. It's the simplest answer.
But even if it did take place elsewhere, why is it so difficult to understand that tossing a body into the deep ocean in Aruba is so difficult? That would be easy to do.