Warning. The following is TL;DR.
1. Start with the OBJECTIVE. Trips have themes too. You can have a historical/scenery, cultural experience, industrial experience, otaku experience etc.
2. Usually, one would match the objective with a particular event that will be the 'highlight' of the trip.
3. As mentioned to some, I've been there in 1993 (cultural/life experience), 1996(space/technology) and 2007(historical/scenery - hanami (sakura bloom))
4. Once you ahve the objective in mind, then you can start using the tools to build the trip
a)
MATTA FAIR - cheap tickets sold during this event. This year it's held at Putra World Trade Centre, 12 March 2010 - 14 March 2010
b)
Japan Guide - simple to use event search and travel advice
c)
Japan Rail Pass - uber blessing of unlimited transport while you are there
d)
Hyperdia - plan every train/bus/ferry ride to the minute!
5. The 2007 trip was done in April, at a budget of RM6500 (but I lavished on yukatas at the end). Without the yukatas, easily RM5.5k. The trip had the following itinerary
7-Apr-07 Sat Msia – Tokyo,
8-Apr-07 Sun Tokyo - basic, Akihabara
9-Apr-07 Mon Tokyo - Odaiba
* 10-Apr-07 Tue Tokyo – Osaka
* 11-Apr-07 Wed Osaka – Kyoto – Osaka (Spot ON! Kinkakuji Temple at full sakura bloom!)
* 12-Apr-07 Thu Osaka – Kyoto – Osaka
* 13-Apr-07 Fri Osaka – Hiroshima – Osaka
* 14-Apr-07 Sat Osaka - Nagoya - Osaka (but my 2 friends just stayed at the hotel, enjoying 10MBps internets)
* 15-Apr-07 Sun Osaka – Kamakura – Tokyo (Kamakura Festival) - horse riders with bows!
* 16-Apr-07 Mon Tokyo – Hakone – Tokyo (to see Mount Fuji - epic fail!)
17-Apr-07 Tue Tokyo – Nikko – Tokyo (Shunki Reitaisai (Grand Festival of Spring)) - festival at a world heritage site temple
18-Apr-07 Wed Tokyo – Asakusa/more Akihabara
19-Apr-07 Thu Tokyo – Shinjuku/Harajuku/more Akihabara + final dinner
20-Apr-07 Fri Tokyo – Msia
(* denotes days in which the rail pass was activated)
6. Major cost break down (2007) - 100 yen = RM3.412 (now is 100 yen = RM3.67815)
a) Flight - RM 1674
b) Japan Rail Pass (for 7 days only) - RM890
c) Hotels - 2500 yen in Osaka, 3780 yen in Tokyo - about RM1290 for accomodation
d) Travel cost outside of the rail pass - about RM500
e) Food - BRAHIM, Maggi and Milo packets!!!! The cheapest meals ever! Buy some lettuce at the groceries, and you have a wholesome meal. 1 day = RM20 only!
--- you can still buy meals there, but it's about 500-1000yen each. About RM 18-40 per meal
f) Entry fees into various places - about RM350
TOTAL above = about RM5k... and I bought like RM1k worth of souvenirs