Ton Nga Chang Waterfall is the strongest nature outing from Hat Yai, set in forested hills west of the city. The name means "elephant tusk", a reference to the way the water splits around rock on one of the falls, and the series of cascades gives you more to explore than a single roadside pool.
It is popular with local families on weekends, but walk farther up and the atmosphere becomes quieter. The lower pools are the easiest for a short visit; the higher tiers require more effort and better footwear. After rain the waterfall is much more impressive, though the rocks can be slippery.