Here is the thing.....allow at least an hour if using WDW transportation. You can take a bus to a park or downtown Disney and then a bus to Boardwalk, Yacht and Beach Club or Swan and Dolphin...all take you to the Boardwalk side of WDW where the Yacht and Beach Club, Swan and Dolphin and Boardwalk Resorts are. So depending on which bus comes first, I would grab any of the three and get yourself to that side of WDW. Once there you can walk from Boardwalk, Swan and Dolphin resort to the other side to get to Cape May which is located at the Beach Club..
If you take the bus to MGM, you can walk it, but it is a little walk, you can also take a boat but not sure if they will be open if you have an early adr..
You can also walk out your front door of the ceremonial house and grab a taxi, but with 8, it would be at least two taxis, I think.