如果唔跟團去的話...

懂日文, 去邊都得.

不懂日文但懂英文+中文字可以去東京,大板,北海道,廣島,等大城市.

英文都不太懂很難說,可能只能去東京+橫濱中華街.  要不然跟個團最方便, 但係報紙上既團都係低能團, 5日去5個disney式既公園, 唔係帶細路去都唔會坐幾個鐘飛機去遊花園, 食垃圾, 買貴野... ^_^

仲有睇你想達成什麼目標?  shopping? 溫泉? 風景? ...

乜都有但冇時間既就去東京, 好多時間既就係自己國家既ANA/JAL辦公室開張railpass7/14/21日內全日本到處遊山玩水.

英文ok上呢個網有全日本大部份城市既旅遊地點.
http://www.japan-guide.com/

小心去d免稅店.  東京秋葉原有幾間就係專賣舊貨俾講中文的遊客, 佢地請咗幾個住本地既大陸人幫手sell客.  專攻出口既日本貨又舊又貴, 真係買唔過.  所以如果要喺日本買野, 最好自己做多d資料收集.

not everything can be found in those 3 places...

i recommend magazines rather than books because information is newer, there are sometimes discount coupons in magazines, and the sources are easier to trace.  information in books are often dodgy, with few statements to back up their logic.  also, if you want a more local experience, buy local magazines like Tokyo Walker, Non-no, Hobby Japan, GoodsNavi, etc... (you can buy these at Sogo, but better and cheaper just to get them at the airport when you arrive.  train from Narita to Tokyo city takes 1hr anyways, so lots of time to read).  i've read lots of HK and Taiwanese magazines, and usually the places they suggest are...  crowded with other tourists, and it will feel more like HK or Taiwan, with all the c9(obasan) bitching and gossiping, it really becomes irritating when you've payed thousands of dollars for a ticket to experience something different.