Hi Vinod, I would strongly suggest Ooty, but make sure you don't stay in the city but somewhere near it. That way you would have a lot of time to spend with yourself and also to get to the city you would need to use local means. The Hills are a perfect place to spend some quality me time! I started my solo travelling journey with Ooty and it has been amazing since.
Hello It really depends upon your choice
I would suggest as following 1) Kodaikanal - can be combined with Madurai and Rameshwaram
2) Ooty & Coonoor can be combined with Madhumalai forest
3) Kanyakumari - can be combined with Kovalam in Kerala
4) Pondicherry along with Chennai
If you are a solo traveller then Yercaud and Kodaikanal, the two famous hill stations, would be an ideal chouce. If you are looking for a beachcation then choose Pondicherry nearby Tamil Nadu with closed eyes and if you are looking for adventure and treasure then it is Mahabalipuram.