Winter-Summerland is located at Blizzard Beach waterpark. If BB is still closed for refurbishment, bus service will be available only from Epcot or Coronado Springs Resort. If you're at another resort, travel to Epcot, and then take the bus to CSR, which also stops at BB. If you're at MK, take the bus to CSR and wait for the BB bus at any stop, or if you prefer, take the Express Monorail or ferryboat and then the Epcot Monorail. The bus to CSR would likely be faster. If BB has reopened by the time of your trip, from any park or resort, take the bus to AK and transfer there to the BB shuttle bus during BB operating hours. After BB closes, see the directions above; the bus from Epcot to CSR & BB runs every day until at least 10pm.
Fantasia Gardens is across the street from the WDW Swan Hotel. From AoA, I suggest taking the bus to DHS and then the boat to the Swan. Ask the boat crew or a hotel employee for walking directions. You could also take Uber/Lyft or a taxi; the 2 locations are fairly close together and will probably cost under $10 in fare. From MK, just take the bus to the Swan.