We are thinking of going to Phuket with my parents and my grandma ~ The time for flight is not too long, and we will rent a car and drive them here and there~ They can go back to the hotel for some rest in the middle of the day and then go out again for dinner and massage!
As we have went to Koh Samui 3 months ago for a trial, we think the food, the car renting and the great resort made it easy for planning to Phuket with grandma in Sept or October~
Singapore is also a good and relaxing place~
For Taiwan, there maybe too much walking for elderly!