Thinking about visiting Kerala

Hey Guys, I am thinking about visiting kerala, a solo trip, I dont know anyone there I live in Mumbai, can you guys guide me on what train, where to get down, which station is nearest to destinations, and not touristy spots but good spots known to locals, I dont understand entire malayalam but I have always seen movies in malayalam and have gist of it and as a telugu I get it a bit. will be walking most of the time and hitchhiking.