When going to the Magic Kingdom after the bus leaves it will then stop at the Swan and then the Dolphin before it gets there. However when leaving the Magic Kingdom the Boardwalk is the 1st stop.
As for Downtown Disney the Boardwalk is the last stop when going there since it will have come from the Yacht Club, Beach Club, Swan and Dolphin. When coming back once again the Boardwalk is the last stop, although one tip you can do is get off at the Swan and walk back to the Boardwalk. My parents did that earlier this month and it was a lot faster then staying on the bus.
I can't say what resorts the Animal Kingdom bus shares with since that's the one bus I have not taken when staying there.