Auroville - it's a very peaceful place
Rock beach
Paradise beach
Serenity beach
And U must have to try Le Dupleix - it's a hotel. Amazing food and live music. It's a best relaxation.
Auroville.. Rock beach.. paradise beach.. serenity beach.. churches.. If you have time.. you can visit mahabalipuram too.. Its around 100 kms from pondicherry..
I had been to pondicherry for a solo trip last month. You can check my photoblog and trip on tripoto l. Also, you can message me and I can give you the whole itinerary