Try using all the keyword that you have as links on the left side such as Kerala History, Kerala Government and such.
Try using Google Keyword Tool. Here are a few I picked from the results. where is kerala kerala matrimonial about kerala kerala kaumudi kerala tourism kerala tour kerala news kerala recipes kerala images kerala package kerala map You have a nice looking site and you can tell you have done a lot of work. It would be better to have a link back to the home page on each page.
You can use the Google keyword tool that will give you an idea of the userfulness of the keyword. Ideally you should try and select a keyword that has low competition and high number of searches. Unless you are sure of what you are doing and the keyword matches with the theme of your site.