There is TONS to do in Tokyo. I was there in July for 3 weeks, and I never had a moment to spare. If you don't like bars etc., one suggestion I would highly recommend would be to take the JR Train over to Tokyo Disney Resort, home to two of the best theme parks in the world. Tokyo Disney Sea is amazing, and a one-day pass is around 6400 Yen, which is not bad at all. Also, Tokyo Disneyland has a lot to see.

A lot of it has to do with I think attitude and mindset. Also, I always purchase a Fodor's Guidebook (paper version) for any destination I will go to. It is really good at helping you to understand what to see, and what is worthwhile. In a way, it is your guidebook to the city. In fact, I even have one for my HOME city (Chicago).