Yup, Sijuki is right....and you'll meet tons of other people besides tpunk people.
As most people here would attest to, we were all a little nervous before our first big trip alone, but it was the best thing ever! I am now convinced travelling alone is the only option for me and a little nervous that I'll never be able to fully enjoy myself travelling with others!!
Flight to Tokyo: 92,000 yen
Metro to Ginza shopping district: 160 yen
Watching middle-aged Japanese woman dance to U2: priceless