You need a whole week to visit full of Kerala. The basic budget ranges between 12k to 20K based on your mode of travel and place of stay. I travelled for a week to Kerala couple of years before. My budget came upto 30k based on place of stay and transport. Since I travelled from chennai, I used train, ate in many mess to try local food.
There are lots of places to visit in Kerala like Alleppey, Kochi, Thekkady, Munnar, Thrissur, Kovalam, Wayanad, Thiruvananthapuram. For more detais visit Cheapest kerala Tour Packages at https://www.arcadiavacations.in/Kerala.html
It totally depends on -
- Number of people going for trip -Number of days - what kind of trip you want a luxurious one or in budget Or under budget - There are many places in Kerala, so it depends on the places too! -the mode of transportation you prefer!