Definitely not lush. Paved concrete. The pool was shallow, about 3 ft from memory, hence the warm temperature. About a dozen deckchairs in a row.
I think the only way to get greenery in Bombay is to head for a park , with the rest of the population.

If you were looking for a outside escape, the Taj has a better outdoor ambience, but it is nowhere as stylish as the G Hyatt