Sixth step of the journey in Kerala might be this Tiger reserve in Parambikulam, which is in the same mountain area than the Athirappilly Waterfalls but with a very difficult access to the road. Then It might take me 5 hours to get there.
However, it might be worth the trip because this is apparently one of the best thing to do in Palakkad, and there is not only tigers because there is a famous Wildlife Sanctuary there where you can see wild leopards, elephants, deers and so on. It might be an alternative to the Gir National Park, which is not the best and is very commercial according to my Indian friend.
This is what does the Safari looks like there: