I can suggest an Ayurvedic beach resort very much closer to kovalam hardly 10km but away from the rush of the beach near to vizhinjam.they have private beach , pool n individual hut like rooms with ayurvedic massage and treatments available. Very much private kinda area n mostly occupied by foreign tourists n north Indian tourists during season times. So can enjoy yourself without much concern about the locals .Not many locals have idea about this private beach. I got acces to their private areas only coz I was there on behalf of my company n got to stay there as a guest
but it's been amazing to watch the kinda exhibitionism n stuff going on there n in the pool as well. but I could not enjoy much since I was busy with my work.but it was very much private n you can enjoy to the fullest.