Luggage and bags: Pack lightly!! Taxis from the international airports are expensive. In most train stations; porters are scarce as are escalators and elevators. The less you have with you the easier your trip will be!
Clothing/Shoes/Weather Gear: Except in the heat of August, when it's always hot and muggy, the temperature is unpredictable. In spring and altumn, you'll need a jacket or sweater. In June-July it is rainy season , it can be cool and rainy or warm and rainy, so make sure you have a light jacket and folding umbrella. Summer is hot and humid, but you may need a light jacket to prevent yourself from freezing in air-conditioned hotels and restaurants! You'll need a fairly heavy coat in the winter since it can snow in Nagoya. Comfortable walking shoes are a must and slip-ons are highly recommended.
Photo Equipment: Camera film purchased at a discount electronics shop is one of the few things cheaper in Japan. Throw away cameras are also readily available.
Luggage and bags: Make sure you have plenty of room in your suitcase. There are tons of great deals in Nagoya's shopping district, Ossu-Kannon.
Clothing/Shoes/Weather Gear: Bring comfortable shoes. There will be a lot of walking to do if you can't afford a cab.
Photo Equipment: If you have a digital camera and always wanted to make prints, Japan is the cheapest place to do it. At any Fuji shop a print is only about 20 yen and will be ready the next day.