Luggage and bags:
well backpack is good,duffelbag what ever takes your fancy and depends for ho long you'll stay in Kaikoura
Clothing/Shoes/Weather Gear: it could be 4 season in a day, NZ is like that, a jumper will do no harm
Photo Equipment: lots of
Miscellaneous: that is realy a must, for a dip in the sea or pools..swimsuit, sandals for walking around and a good big towel. ..all toiletries you need for the shower afterwards, shampo, you realy need the get the salt of your skin. suncream a must too, lipbalm and a hat. don't dehydrated..take your waterbottle with you...or buy from the provided vending maschine.
Good comfortable shoes is a must. An umbrella for rainy days. Hat / sunscreen is a must for sunny days.
Toiletries and Medical Supplies: It's best to have enough as this is a small town, you might not be able to find what you usually use. If you do, it might be a little bit more expensive.
Photo Equipment: It's best to carry enough batteries and film with you.