The Tokyo Disney Resort consists of two main theme parks, several hotels and a reasonably sized shopping area. In order to get between these attractions, the best method of transport is the Disney Resort Line monorail service.
As you can see, the monorail can also be decorated to celebrate whatever season or festivity the Tokyo Disney Resort is partaking in at the time! In this case, it's for Tokyo DisneySea's Spring Carnival 2010.
The monorail serves the Maihama Station & Disney Ambassador Hotel (train station), Tokyo Disneyland (TDL Hotel and Bon Voyage! shop), Bayside (the official hotels of Tokyo Disneyland) and Tokyo DisneySea (including MiraCosta hotel).