Approaching midday, the blistering sun beats down and slips through the teak tree leaves. Eyelids grow heavy as a gentle breeze whisks by. On the water, ripples bump into each other, and those lazing about seem to say, Ahh, this is the life!

It's lunchtime and a small army of office workers has temporarily forsaken their concrete and glass enclosures for the wide-open—and green—spaces. They forget their fatigue and leave behind stress