tThe subway can be pretty confusing. Working out the route is the easy bit, just make sure your hotel has the most updated subway map - some are still distributing maps without the new lines. But the trouble lies in working out the correct exit at the massive stations like Shinjuku which spans entire neighbourhoods and districts.
Also the addresses have building numbers rather than street numbers which makes it confusing to work out where to go - you want to look out for little police counters which are rather ubiquitous and they're pretty good in pointing you the right way. A lot easier if cabbing it, as most of the cabbies have GPS, and cab fares here are reasonable compared to say Melbourne. Always have addresses translated into Japanese by hotel staff prior to going out.
Fab shopping in Shibuya and Harajuku, a lot more interesting than Ginza (unless you are aiming to stock up on Burberry - they also have local versions of the brand there, Purple and Black Labels which are exclusive to Japan). Omotesandō in Harajuku is a must visit. Shopping there is totally fierce. Massive designer flagships, even bigger than those in Milan and LA. And everything is very elaborately done up. The shopping here is the main reason why I go back to Tokyo again and again.
Ginza fish market is worth checking out for some of the freshest sushi you'll ever eat in your life. You need to get there early as they open and close early. They open at 5am, which is also rather handily - when bars close and the subway starts operating. Nothing like the best sushi in the world to sober up on.
Otherwise Roppongi (kinda the Lai Kwai Fong of Tokyo, where a lot of the expat/tourist bars and clubs are situated) is also good fun.
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