I'm thinking that he took Natalee to his private apt, and told her he would drive her back to the hotel (he had a car). It doesn't add up that the brothers just dropped them off by the light house or some other place and left them to fend for themselves.
They are all lieing. We're thinking beach...because they wanted us to.
sw
Your theory makes a lot of sense.
If we go with your theory then where does Steve Croes fit in?