Winter Summerland is next to Blizzard Beach so you could take that bus from your resort. For Fantasia Gardens probably go from your resort to a hub (theme park or DTD) then change over to the Swan/Dolphin bus. It's across the street from those resorts.
Correct. There are no busses that go directly to either mini golf place. Hope you don't let that deter you. Mini golf is loads of fun! D18 and I have been big fans of Fantasia Gardens for years!!!