I Think kerala is the best. because Kerala tours-Experience the Beauty of Heaven on Earth If you are interested in Kerala Honeymoon Packages please do visit to the site http://www.keralahoneymoonpackages.com/
Looks like lot of people are promoting Kerala but I will tell you there are lots more. Goa is flooded these days. Other are some hill station like Panchgani and Darjeeling. Also Sasan and few others in Gujarat are also great.
I also agree with shabbir that there are many places in India to visit such as Rajasthan,Himachal Pradesh,Nanital and many more...........
The good destination of india is Golden triangle Tour .It a three amazing city tour i.e Delhi Agra Jaipur .Delhi is the capital of India,Agra is The Taj City and Jaipur Is the pink city .So you must have to visit these three places nagd make your journey unforgettable...