If you're a fan of deer, then this place lets you pet and even feed them! They are very cute and love to interact with people, they won't bite so it is pretty safe to be with them. I think this is a very interesting experience that you should try at least once in Taiwan!
It is located in Yilan which is on the east side of Taipei, the admission fee is pretty cheap too so you don't need to worry about it. There is a bus you can take from Taipei to Yilan and then you can either take an Uber or take the train to reach this spot.