Cabanas is the Disney Fantasy equivalent of the Lido, this is where you can grab a meal B, L, or D with no fuss and no muss.  Having been on many cruise ships and experienced a panopoly of different pool level buffets, I have to say that Cabanas has the best layout of them all.  It is spacious, and airy and intelligently laid out in terms of movement, seating and traffic movement.  There are a bunch of different stations serving everything from pizza to pasta to salad to roasts.  Each station is individually accessible which means you can usually avoid long lines -- with the exception of the salad bar which seems to get pretty backed up. 

This is the same layout as the sister Disney Dream and far superior to the old Disney Wonder and Disney Magic. 

Food quality is generally good, my favorite thing is the real turkey breast sliced off of a whole turkey which only seems to be available