We stayed at the Blue Sea in Kovalam, up on a hill, and interesting 'cos it is, if I recall, completely cylindrical.
A good roof for having a wee toke and playing backgammon, and clean rooms.
Try a houseboat trip as well for a coupla nights, as that's a good experience.
One tip, though. If you like your sleep unbroken, take some earplugs with you. Seriously, there's no end of dogs-a-barking, cocks-a-crowing, holy men calling folk to prayer, festivals-a-celebrating and so on.
Have a great time and take something to settle your stomachs. Things will happen.