If you wish to catch the scenic valleys, the best time to visit the place would be before 2PM. But if you want to watch snow-like clouds (only in winter) beneath you form an ocean, reach the place between 3PM and 6PM. Try and catch the sunrise here or in the nearby Greenlands Hostel. At evenings a view of the Jewel Box (evening view of Theni and Periyakulam)is also an attraction. A marvel. Also try out the telescope near the main gate. This place is very near the bus stand.