[Sangetsu]

That should be plenty, particularly if you are sharing a hotel room. But be careful, you'll find it's very easy to spend money quickly, especially in Tokyo. Museum tickets, taxi fare, restaurants, vending machines, etc. I'm always amazed at how quickly such things add up.

The only shopping you should be doing here is for the typical souvenirs most westerners buy. With the exception of video game consoles and digital cameras, you'll find everything cheaper in your own country. On second thought, you're from the land of the "VAT", so perhaps a little more shopping would be okay.