Such considerations are driving the effort to tell Olympic spectators to walk rather than ride.

WSJ: Timing an Urban Stroll Isn't a Walk in the Park

On our first afternoon, we opted to walk rather than ride, so, as soon as the heat of the sun began to diminish, we set out into the bush accompanied by eight or nine elephant and several guides (including one with a rifle).

FORBES: Paul Allen's Revitalized Abu Camp in Botswana