Those gardens are lovely. I can't enlarge the pictures enough to see the images well, especially the photo on the left. Perhaps if you can post the photos individually it would help. I can say, like Christine says, A is a banana (Musa family;) B looks like a Colocasia; C might be a Fishtail Palm (Caryota mitis) but I am not sure on that one. D might be in the Bromeliad family perhaps one of the larger Neoregelias or maybe even an Aechmea. I first thought it was a Dracena but upon looking at it again I think I see thorns along the edge of the leaves which would mean Bromeliad - if I am wrong about the thorns do check the Dracenas.
