"One can swim, row a boat, stay on a tree house and watch the sunrise, have a picnic at the beach and play beach volleyball, go trekking, or even fishing! It has a fully functional water sports center and a breathtaking pool amidst the backwaters."
I'm not sure there's a pool or fishing facility, but the beach here is blissfully relaxing. You won't find a huge crowd about. Chunnambar is around 7 kilometers from Pondicherry, at Ariyankuppam. Get that right. People you ask directions from just might not know Chunnambar. So ask for Ariyankuppam.
The beach is at the mouth of the backwaters. The sand is clean and sprinkled with shells. Boy! That's something you don't find on beaches these days. Plastic, maybe, but shells in such numbers... oh no.
You might want to check out the Chunnambar Beach Resort and the Sea Gull Chunnambar Beach Resort if you plan on a longer stay and not a picnic. I guess both these resorts are the same. Mine was a quick trip to Chunnambar. We didn't stay here.