Welcome, it is not recommended to come to Taiwan in the summer because the weather is very hot, avoid May ~ September, do not go to the north of Taiwan in the winter, where it will rain every day, the southern part of Taiwan in the winter is warm and will not be cold, and almost rarely rains.

If you look at the map at https://map.bitcoin.com/ the merchants that accept cryptocurrencies in Taiwan are mostly Bitcoin Cash, and a few Bitcoin Cash merchants can also accept BTC or ETH.