Disney Sea opened next door to Tokyo Disneyland in 2001. It's unique to Japan and has a different feel to its neighbour and is split into waterfront/port themed areas. It has a big selection of rides and restaurants, but the locales are also really interesting and it's great to just walk around and take it all in.
Like any theme park, it can get pretty busy in peak seasons like summer and during the Halloween event. Stick to weekdays if you can.
Tokyo Disney Sea
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