Hi, Depends on What you plan to do 1. Do not overspeed. If police identify u not as a local you are in trouble
2. Do not litter. People are very particular about cleanliness
3. Very little hindi. Difficult for people who don't know malyalam 4. Everyone loves yamaha rx100 and bullet
5. Traveling in local bus is a nightmare
6. Paradise for sea food lovers
7. Should nog pay toll if you are a local or in govt vehicle apart from main highway tolls
8. Respect customs
Also please take care of the month you are travelling in.Kerala monsoons can be really heavy. October to Februrary is pleasant. June to September can have heavy rainfall.