Tokyo Day Passes - Which one to buy?

Hi All,

Need an urgent reply or help on this :

I am in Tokyo from 11th May to 15th May,
1. I am planning to go to Mount Fuji on 11th May. Does the JR Pass work there or do I need any other Ticket or Pass ? I want to go on Lake Ashi side - What areas to look around there ? Does Hakone come the same side ? Is there better way to cover Mount Fuji ? I am having JR Pass for 11th May.

2. There are different options of Tokyo Day passes ?
a. Greater Tokyo Pass for 3 days costing 7200 yen or
b. Tokyo Subway 72-hour Ticket – Adult: 1,500 yen, Child: 750 yen
Cost wise b option is far better. But will it cover all sight seeing places like Disney Sea, and other places in Tokyo without much hassles ?
or Should I buy Greater Tokyo Pass ?

Please require urgent reply on this.

Thanks,
Dipen.

You must Buy JR Tokyo wide pass 3 Day=10000 yen.this cover Mount Fuji,Disneyland,shinkansen,limited express train.