There's no one-day ticket that allows you to go to both parks, unfortunately. You could purchase a regular park ticket for DisneySea and a starlight passport (allows entry after 3pm) to Disneyland or vice versa.
Originally Posted by
moretimeoffguy
Looking at Tokyo Disney's ticket purchase section, it seems there's no equivalent to WDW's Park Hopper. Just a 1-Day Passport allowing access to only one of the parks. Am I missing something? That's unfortunate. I routinely visit more than one park in a day at WDW. Probably a max of three in a day. Then again, I know how to navigate those parks and don't mind lots of brisk walking.
In fact, unless it's wall-to-wall people, I'd probably try to visit both Tokyo Disney parks in a single day were it possible--just to get a taste of what it's like. Obviously it would be a superficial visit; and some would balk at the idea. But it would work for me.
http://www.tokyodisneyresort.jp/en/ticket/