Current plan.

1st Sep > Reach Tokyo (head down to Shinkuju)
2nd Sep > To Gotemba Station (reach around afternoon by Odakyu Hakone Highway Bus)
2nd Sep > Start Climbing Mt Fuji (stay at hut for the night)
3rd Sep > Descend from Mt Fuji (head down to Kawaguchiko area)
4th Sep > back to Shinjuku (fujikyuko bus / train)
5th Sep > Tokyo
6th Sep > Tokyo
7th Sep > Outside of Tokyo (still planning-any suggestion?)
8th Sep > Outside of Tokyo (still planning-any suggestion?)
9th Sep > Tokyo
10th Sep > Tokyo

Have a question, is there any luggage storage facility at Gotemba? Can't find any, and is't the storage at Shinjuku station can be use for continuously in several day?

8k~15k/person/night consider cheap ? wow ... I really makan beras tak tau harga beras, just because due to cheap air tickets only buy, without thinking the travel cost there.

sep-jan low yield for those crab ?
what is the price for those 3 crabs normally?
really need to survey first.. else later over budget.
     

8k~15k/person/night consider cheap ? wow ... I really makan beras tak tau harga beras, just because due to cheap air tickets only buy, without thinking the travel cost there.

sep-jan low yield for those crab ?
what is the price for those 3 crabs normally?
really need to survey first.. else later over budget.
     

i'm using this
https://www.japan-rail-pass.com/
put it 10k, due to RM is weakening
Onsen hotel/ryoken is very depending, price can be huge different
standard 3 star hotel will be RM300~500
room rate for 8k yen to 15k yen conside cheap in japan
so far the highest i stay was 60k+ per night, and this is consider middle top only.

Thank yo for sharing this info.  I did use this website service before, the courier fee will be FOC if delivered to Singapore but not here (with the conditions at least 2 green card pass or 3 ordinary JR pass).
It is really a good deal if bought three or more pass in one order.

i heard crab??

my review
King Crab (grill) super delicious

Hairy Crab ~ waste money... DONT ORDER!!!~

Hairy Crab can be very delicious also. I know a shop at Sapporo specialist do hairy crab only. best Yo.
Hairy Crab shell as bowl , yoke + fried rice + crab meat.  

Overall still budget. Got money sure can having king crab full meal.  Willing to spend then King Crab Leg / Echizen crab.  Kiamsiap type then eat Hairy Crab

Yes. There are luggage storage at Gotemba Station.
Best way was used "Black Cat" Service once you check out from Shinjuku Hotel. Ask them sent to your next Kawaguchi Hotel.
http://www.japan-guide.com/e/e2278.html
It will save you alot of time, because you no need waste time go back to Station reclaim your bag.
Mid of October are Hokkaido best timing for autumn view. It also Hokkaido most expensive time.
Seafood at Hokkaido also high season from Sept - Jan. 

1st class King Crab price are most expensive at this period.
2nd Class Ekizen Crab price are higher than normal due to high tourist season.
3rd class Hairy Crab will be cheap because high season...alot of catch.

day trips from Tokyo?
personally i really enjoyed Kamakura and Nikko.
but there are others around Tokyo too. Yokohama. Kawagoe (i liked it too).
Disney Resort? 

Yea, Kamakura is on my list and maybe can include Disney world as well  .

For Kawagoe, possible to cycle around it?? Haha, Yokohama dint caught my attention.

Disneyland and Disneysea will take at least one day each. so you need to choose one of them if you're only allocating one day for the trip.
Kawagoe I think no problem cycling around.
Yokohama nothing much actually. don't think it's a must unless you really have nothing to do hahaha.
have you put Odaiba into your list? can easily spend one day there as well.

odaiba need one day?
i was planning on my itinerary, was slotting in odaiba for few hours for gundam, ramen and rainbow bridge view only

i took 4hrs for dinner, gundam, rainbow, dinner...
6pm to 10+pm

i would like to advise u, dont go too late...
coz i missed the gundam light show 

and dont dont dont forget... must go to 7-11 beside the gundam
there u can buy special edition gundam (not sold anywhere) at 7-11 price

if u wish to shop, odaiba is also a good shopping place...

any particular timing for light show?

forget, if not mistaken i think last is 8pm... not sure
tat day i took my dinner longer than expected 

the rainbow bridge, u can schedule it last...
i view it at one of the shopping center viewing platform
there is not closing time!!!~ becoz it is outside!~
(u need 18-200 zoom camera here!!)

i got none of that
kit lens have lag
prolly will buy a 50mm portrait lens

Disneyland and Disneysea will take at least one day each. so you need to choose one of them if you're only allocating one day for the trip.
Kawagoe I think no problem cycling around.
Yokohama nothing much actually. don't think it's a must unless you really have nothing to do hahaha.
have you put Odaiba into your list? can easily spend one day there as well.

i took 4hrs for dinner, gundam, rainbow, dinner...
6pm to 10+pm

i would like to advise u, dont go too late...
coz i missed the gundam light show 

and dont dont dont forget... must go to 7-11 beside the gundam
there u can buy special edition gundam (not sold anywhere) at 7-11 price

if u wish to shop, odaiba is also a good shopping place...

Can refer to Page 1 Tips of the months. Best place for shoot Rainbow Bridge picture.

i got none of that
kit lens have lag
prolly will buy a 50mm portrait lens

Can refer to Page 1 Tips of the months. Best place for shoot Rainbow Bridge picture.

Haha, Disney still in consideration.

Yup, Odaiba is already in my list.
Nice and thanks for the info, can get some stuff before heading back. 
Guy, beside Kawaguchiko area any other place nearby fuji lake have nice Ryokan?? Found few in Kawaguchiko but all fully booked