Cherai has this uniqueness of a laid-back beach and an equally idyllic backwaters sitting side by side.
Kappil is for those like solitude beaches. Obviously you'll not find the typical touristy paraphernalia at Kappil.
The pomp and fanfare apart, touring backwaters of Kerala in houseboat is an expensive affair. The rates are usually steep, running into a couple of thousand rupees per night, even during the off season.
Here is a list of Best 25 waterfalls in Kerala