I was in Kochi recently and was stunned by the beauty of this small city, such great heritage and friendly people.
The fragrance of the colonial times still lingers on in the Kochi Fort, add it to your must list if you are visiting Kochi. Enjoy the walk on the beach in the evening and hit one of those charming restro pubs in the night near the princess street.
Here is a detailed post on my experience:
Kochi tips and travel guide