While you can drive into the city, it's really not recommended as the city can be congested, signs may be confusing and parking fees are astronomical.
Hitchhiking into Tokyo is pretty easy, but hitchhiking out is considerably more difficult. It's definitely possible for determined cheapskates though, see Hitchhiking in Japan for a detailed list of tested escape routes from the city.
The Most Frequently Asked Travel Questions about Tokyo
Where To Stay & Best Hotels in Tokyo - updated Apr 2024
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Tokyo Travel Guide from Wikitravel. Many thanks to all Wikitravel contributors. Text is available under Creative Commons Attribution-ShareAlike 3.0, images are available under various licenses, see each image for details.