Jenjie--thanks!
Re your question, assuming you are taking WDW transportation your only options are WDW buses to the parks/DTD/water parks.
I timed the trip time from A of A to MK at 18 minutes on the bus. You then need to build in time for the possibility that you just missed the bus (20 mins is a conservative number) and getting from the bus stop to the final destination.
For Kona, you can ask the bus driver to drop you off at Poly--which is not likely, but possible--take the resort monorail (if running--for the earliest reservations on 9a MK openings, it may not be running yet) from MK to the Poly, or take the express monorail from MK to TTC and walk from there to the Poly. Build in another 30 mins for the monorail options.
For early breakfasts in the resort hotels I tend to take a cab--it costs an extra ten to fiftenn bucks or so, but it simplifies timing and process, and lets us sleep in later...A of A has a cab stand in the check-in parking area...
Hope this helps and thanks again!
Dave