Luggage and bags:
Travel light....it can be hot and humid! Even a light bag will feel heavy!
A day sack for carrying camera , water, sunscreen etc
Clothing/Shoes/Weather Gear: Loose light weight clothing
Slip on shoes for doing the sights....Jewish synagogue, Dutch palace etc, you need to remove your shoes before entering, but if using the ferries, beware that you sometimes have to jump between the gang plank and deck, so you don't want to lose a slip on/flip flop overboard!
Toiletries and Medical Supplies: Plenty of pharmacies etc in Ernakulam, but pack essential medications etc.
Rehydration salts, immodium , toilet paper, wipes - 'just in case'
sun protection essential
Photo Equipment: Plenty of film, batteries, memory cards etc.- Carry as much as You can- It's a photographers paradise!
Camping/Beach/Outdoor Gear: Sun protection, shades/ hat/ cover up especially when travelling on the ferries.
Miscellaneous: Loose coins for the snake charmers/ beggars / church/ synagogue donations etc.
wet wipes/antiseptic hand gel/ tissues, as restaurants don't always have soap/towels
binoculars for spotting dolphins.
toilet paper/tissues - not always available in restaurants/toilets etc.
Bottled water- easy to get dehydrated whilst wandering between the sights!
How are you going to store thousands of high resolution pictures when you're on a photo safari trip? The answer is get yourself a digital photo storage that capable of synchronize you picture whenever your CF/SD/MS is full at your own timing.
You can even forget about looking for cyber cafe to transfer & burn pictures into CDs. Try to imagine having your CD pouch with you & you need to handle them with special care else losing or broken CDs simply means losing all you great shots.
Miscellaneous: Good news for Malaysian travelers that you can easy get one of this portable storage casing come complete with all memory card slots for the price of RM200 from Low Yat Plaza stores. You can opt for 40/60/80GB 2.5" capacity HDD to be fitted into this casing.
I have been using my unit for slightly more than 1 year & I am very satisfied with it.
Luggage and bags:
Travel light, as you have a lot of shopping oppurtunities!
Clothing/Shoes/Weather Gear: It is much better to wear cotton shirts, as T-shirts become clingy, soggy and does not "breathe" well.
Toiletries and Medical Supplies: Mosquito repellent comes in very handy.