Hi zhirong,appreicate your reply.i have never visited japan before.So any kind of experience you could share with me would be most valuable!I will be arriving at haneda airport and staying at the grandbell hotel.Ok i shall try to go to expo immediately after arrival on 25feb.since i will be there for only a few days(25-29),i do not intend to travel far from shinjuku area.i shall try to visit the places you mentioned and purpleberry's recommendation too.frankly speaking,even looking at the subway map makes my head spin.so i think travelling around tokyo would be a problem....So please advise me if you have the time.Thank you in advance!and thanks to evilerniex too.another problem is what if i need to use my phone over there?