First Read ThisI think it is crazy when people get nationalistic about natural beauty (w.r.t. natural beauty). That is so because they did not do anything to make that place beautiful. Nature made it beautiful. It was given to all of humanity to treasure and enjoy!
Just because that piece of natural beauty happened to fall in your country doesn't mean your country or its people did something special to deserve it.
Yes you should be proud of maintaining natures treasures and providing easy access to them but not for possessing them.
I am from India as well and India has its places of great natural beauty (like all countries big or small I guess) but what I am nationalistic about is not the fact that we have these treasures.. but more because we have an equally (if not more) diverse culture.
So many cultures living within India is what makes me proud to be an Indian not the fact that the beaches of Goa or the Great Indo-Gangetic plain happen to fall within the boundaries of India.