JRPass

Hi there!

Hmm... with such a trip where you're based in and around Tokyo, there may be other ways to travel without a 7 day japan rail pass (You'll need to spend over ¥28,300 on JR tickets for a 7 day pass to be worthwhile - in general a return trip to Kyoto for example makes the JR Pass well worth it).

In the case of your itinerary, how about the following:

• Buy a return Narita Express Suica package on arrival in Japan (¥5,500) - this will get you a good deal of free transport on the Metro while you are in Tokyo.
• Buy an Odakyu Hakone Freepass (2 days) (¥5000) - this will take you from Shinjuku in Tokyo all around the Hakone area (one of the most popular hotsprings and places to see Mt Fuji).
• Buy individual JR tickets to Yokohama/Disneyland etc and as needed - Yokohama return is only around ¥900 return for example.
• Buy an individual return to Nikko near Tokyo (¥10,000) - this will let you experience the bullet train and Nikko is a great day trip from Tokyo .

This will bring your total travel spend to something around ¥23,000 and will have the added bonus of having travel around Hakone and ¥2000 of the Tokyo metro built in (The Metro is not run by JR so is not covered by the JR Pass).

Hope this helps!

P.S. You can look up train timetables and costs for other trips at the Hyperdia travel planning website.