Okay....
for 1900 Park Fare, take the boat to MK, then the smaller boat to GF. You can take the monorail but it tends to be a bit longer. I would be at the dock by 8 am in order to have plenty of time.
For 'Ohana, same thing..head to MK then either the small boat or the monorail. The small boat runs between MK, GF, Polynesian and back to MK..continual loop.
To HDDR you should be able to hop on a boat there from WL. It makes more sense to take the boat because the boat drops you right down the path from the HDDR hall. If you take the bus, you have to transfer to a different bus once you get to FtW...at least that is my belief.