Don't forget to bring your camera to capture the spectacular cascades of Shivamathungai Falls. If it's raging, you may be able to feel the mist on your face.
You'll find this cascade of water in Tirunelveli. Once you've explored everything you can at Shivamathungai Falls, check out nearby Manonmaniam Sundaranar University, Getwell Hanuman Temple, and Kanthimathi-Nellaiyapper Temple.