Basically, there is only formal WDW transportation from the resorts to the parks, water parks and DTD- there is no formal transportation from resort to resort. However, monorail resorts are linked to each other- hopping between them on the monorail is easy and fast. Certain other resorts are linked on the same bus route(s) such as the Epcot-area resorts (Beach Club, Boardwalk, Swan/Dolphin, Yacht Club). But this is really unnecessary there since all are a short walk away from each other. Other than that, resort-to-resort is really done via car or cab. For example, when we stay at the Beach Club and have breakfast at O'Hanas at the Polyneisian, we take a cab. On the way back we take the monorail to MK and catch a Beach Club bus going back or ride the monorail into Epcot and walk back from Epcot through the International gateway.