Welcome to the Japan Forum.

Now, at the risk of sounding unwelcoming, have you looked around the forum before asking such a general question? Just in the first 2 pages, I see at least 7 existing threads that address your question, including the thread immediately below yours. If you go back further, there are literally dozens of threads. Folks here are very knowlegeable and helpful but we do weary of constantly re-inventing the wheel. This question has been answered many times before.

After you have done a bit of research, we can advise you on how to do what you have decided you wish to do. What do you want to see? Old Japan or super-modern Japan - or both? In general, we recommend at least 2-3 days for Kyoto and surrounding area. If you are only going to be in Japan for 7 days and want to spend one of those at Tokyo Disneyland, that doesn't leave much time. Two half-days for travel, one day at Disney, 2 (or 3) days in Tokyo and 3 (or 2) days in Kyoto and that makes 7.

For the round trip Tokyo-Kyoto-Tokyo on the bullet train (shinkansen,) you will probably be money ahead purchasing Japan Rail Passes. They are good for 7 days of train travel and will cover the long distance trips as well as local trains and at least one-way between NRT and Tokyo on the Narita Express. You must purchase the Rail Pass before you arrive in Japan and exchange the voucher for the actual Pass after you arrive.

I am a notorious Kyoto-phile, but if I had the time you do, I would spend 2 days in Tokyo, 1 day at Disney, then move on to Kyoto for at least 3 days. If your flight home is late in the day, you can make the trip all the way from Kyoto to NRT, through Tokyo, on the day of departure. If your flight is earlier, you should probably come back to Tokyo the day before departure and spend another night in Tokyo.

If you haven't already, invest in a good guidebook on Japan and do some research on what you want to see and do and post back with some specific questions.

JR