Apparently, this is a thing. You put your feet in a pool of fish, commonly known as doctor fish, and let them munch away the dead skin cells. Not only is this a thing, but it seems to be a popular thing with many countries having their own foot-feeding-fish spas. While in some places it's cleanliness has been challenged (it has been banned in some states in the US as well as some Canadian provinces) it's popularity seems to be growing and in recent years Cyprinion macrostomum fish (the most common type of doctor fish) features have been popping up all over Taiwan.
Agricultural tourism is a very popular thing amongst Taipei residents. For between US$25 and US$40 per person you can join an organized excursion from Taipei Main Station to a farm where you can pick your own fruits and vegetables. As a bonus, there are often a couple “side stops” along the way, usually to a street market or museum. If you have a free Saturday or Sunday and the weather is nice it is one of the best ways to get some clean air, exercise, and come home with something healthy to eat (minus anything picked up at any street markets you stop at along the way, of course).