Japanese will be essential there, people do speak English, but its erm, not snazzy. So a translate book would be awesome. They also didn't give me an English map, but I assume they have them, so if you go just ask, "eigo de kudasai," and they'll understand.
Beware the stares. You are a foreigner, and noticeably one too, for people from less touristy areas of Japan, they will think you are some magical unicorn. A lot of double takes will happen.
Be on your best behavior.
I cannot emphasize this more.
Do not be loud, dont place chopsticks vertically, don't sit on the ground (you will be told to stand up) DON'T BE LOUD, bow when apprioate.
Yes you are in Disney, and you do get some cultural leeway, but impress the Japanese, be a good "ambassador" . Because they assume anyone who is white or speaks english is from the US.
Getting to Disney will murder you, the trains to Disney are a mess, figure out before you go the routes you will need to take.
If Tokyo train lines were string, it'd be a knot.