Start early and head straight to Agaya Gangai Waterfalls, the signature stop in Kolli Hills and easily the most rewarding way to begin the day. From Semmedu, it’s a short drive to the trailhead/parking area, then you’ll need to manage the famous descent to the falls on foot—expect steep steps, uneven sections, and a bit of humidity on the return. Go with proper shoes, carry water, and keep cash handy for small entry/parking fees if they’re being collected locally. The best window is usually morning before the heat builds, and you’ll get the best photos when the gorge is still soft with light.
On your way back up, stop at Arappaleeswarar Temple near the falls trailhead for a quieter, cooler break. It’s a peaceful Shiva temple and a nice contrast after the physical effort of the waterfall descent—take 20–30 minutes here to slow down, sit for a bit, and just absorb the hill atmosphere. After that, continue toward Siddhar Caves, where the short stop feels more like a scenic wander than a formal visit; the caves are simple but atmospheric, and the surrounding plateau views make it worth the detour. If you’re moving by local taxi or self-drive, this cluster of stops works best as one loop before you drift toward the viewpoints.
Before lunch, pull over at Vasalurpatty Viewpoint for one of the easiest panoramic stops in the hills. This is where the road and valley drama really open up—hairpin bends, layered green slopes, and that unmistakable Kolli Hills feel. Late morning or early afternoon is fine here, and you usually only need 30–45 minutes unless the light is especially good. Then head into the Semmedu bazaar area for lunch at a local Tamil restaurant; look for a simple mess-style place serving meals, kootu, rasam, and chicken curry. A good hill-country lunch typically runs about ₹150–₹350 per person, and the best spots are usually busiest around 1 pm, so don’t arrive too late if you want fresh rice and hot curries.
Wrap the day with an easy walk through the botanical garden / local spice-and-herb stop in Kolli Hills around Semmedu. This is the right kind of final stop after a waterfall-heavy day: slow, shaded, and aromatic, with cool hill air and a chance to see the plants and herbs that give the region its character. It’s a low-effort visit—about 45 minutes is enough—and ideal if you want a calm transition before leaving the hills. Plan to start your descent while there’s still daylight, because the ghat roads feel more relaxed in daylight and you’ll enjoy the bends and valley views much more on the way back.