for my new car, i'm preparing:
cashcard,
parking coupons,
street directory,
small box of tissues,
extra bottle each of engine oil and coolant,
car cleaning stuff(shampoo, sponge, chamois etc)
i like the new car smell, so no air fresheners for me. consider
rubber car mats too if u don't like the carpet kind that comes with
the car.
lastly, u may wanna bring it to a car groomer and slap on a few
coats of wax & sealant too.