Last year saw the opening of Tokyo Skytree tower that brought so much people around there. In 2013 Nagoya Castle area will be like this. The first stage opening of Nagoya Castle Honmaru Palace on May 29 will bring millions of people to Nagoya castle from all over the world. This palace is comparable to that of Nijo Castle(World Heritage) in Kyoto and it's brand-new.
Avoid Saturdays and Sundays and Summer Holidays from July 20th to August 31. Visit there on weekdays if possible. Even on weekdays you may have to wait about 1 to 2 hours. The best way is to get there as early as you can before opening at 9 a.m. After getting into the castle ground run as fast as you can to take the best queue place.
They work with a point card system. The more you buy, the more discount you get of your next buy. But we compared the prices in several shops around Nagoya and Bic Camera's prices are MUCH higher than certain other shops. The reduction you get on your next buy reduce the prices to the real market-price.
We bought an mp3-player at Bic Camera. The battery never got to recharge. We went back and they gave us a new mp3-player, whose screen never worked. We went again and NOW we have a good one.
Unique Suggestions: Try to be the 100th buyer. Every 100th buyer gets his things for free. No matter how big!
Fun Alternatives: Osu district: Top Camera got me an interesting discount on my digital camera and the Good Will shop in Osu also got me an interesting discount on my brother's mp3 player.
Don't bother with the 'Little World' theme park, unless you would like a laugh. The park was designed so that Japanese Citizens could learn about other cultures, unfortunately it was probably designed by people who have never left the country.