I just spent 3 weeks researching real estate in Punta Cana area.. using the 4000 square meters to 1 acre benchmark..
The scale I was quoted severa times was
$80 dollars per sqr meter on beach.
then it goes down from there... across road was 60, 55, 45,
I even saw land for 40 per sq meter off beach but near golf...
it really does vary.. and you really need to search..
I saw one condo that was 200K.....it was a dump.. just 1 block over was a duplex each side 140K and very well done...
good luck