Hi
I did the Kerala trip in September. It is a lovely area and very different from the north which I visited in 2012. I particularly enjoyed time spent on the houseboat and visiting villages where tourism US being developed.
There is a very detailed review of this trip in the review section of the forum which will give you an idea of what to expect.
I would recommend that you speak to your GP or Practice Nurse about recommended vaccinations.
Hope this is helpful
Lesley