Believe it or not, in a city built in the desert, there is a ton of green space. Granted watering the grass daily with desalinated water isn't so environmentally green, but it looks pretty. Even the medians on the major roads are grass covered. The medians of the major highways are lined with palm trees. There are parks everywhere.
When the weather is nice, there are a number of parks and fields to take our kids. Even at the side of busy roads, there are places to park your car and playgrounds shaded with trees for the kids to run around. All of the shrubbery is beautifully landscaped as well. "Turning the desert green" seems to be a motto of Abu Dhabi and it is one that they take seriously.