hi mateo,
since you ask for suggestions i will give you an opinion. it is just my way of seeing things so please do not get annoyed at my sincerity.
i would not go for the theme park idea. leave it to disney and for cenographers. what the world does not need is more fake stuff. why pretend to be somewhere else than the place where those beaches are?
why do you not go for authenticity? i would try and uncover the local character (the so called genius loci) and accentuate it.
a theme park project will get old in a few years (to me they are born dead but anyway). something authentic may be interesting for decades or centuries. but you are the one to decide what to do.