Tokyo Disneyland is almost indistinguishable from the other Disneylands, so I would consider it a waste of a day in Japan unless you are a Disney buff checking off all the parks. I was there on its second anniversary in April 1985, age 9.
I speak some Japanese, but would not attempt driving there. There is no reason to, since the trains and other transport are so good and so reliable. Enjoy the wonderful eki-bento (train lunch boxes) and vending machines.
I’m sorry I didn’t see this thread earlier – my main advice for Japan in July would be to go north! Hokkaido is beautiful and comfortable at that time of the year. If you’re used to Atlanta or Houston summers, that’s what you should expect in Tokyo/Kyoto.