Been to Tokyo twice now. Depends what your going for and looking to do. If you go to Tokyo and you want to go to bars and clubs then Roppongi, Shibuya and Shinjuku are the places to go. Like mentioned previously the exchange rate is crap at the mo....so you wont get a lot for your money. If you want gadgets then go to Akhiabra. All the places on the main strip are full of gadgets. But beware most of the really interesting stuff will not work in the UK. And the stuff that works in the UK is nearly the same price as it is here. With regards to car parts, remember the Is200 is known as the Altezza in Japan. So you need to go to Toyota to get parts. Bit difficult in Tokyo, but more easier outside of Tokyo like Yokohama etc. When i went the 1st time the exchange rate was good so i bought myself the full arm rest kit from Lexus Japan, but i had to take someone with me who spoke Japanese and i had to take a list of part numbers so the correct stuff was ordered. I was lucky as i was out on work there so i took a guy i worked with with me.
Well if you wanna know any more, give me a shout. But one thing i will say, Japan is the nuts mate!!!! You wont be dissapointed when you go, just hope your ambitious with your food.....