Not sure which "typical" activities you've already done. Kavalan distillery lets you walk through many of their buildings and see the different stages of manufacturing. There is also an exhibition with some background on whisky, free tasting area and a well-stocked shop selling all varieties of what they make. No advance appointment is necessary. It's more like half a day trip by itself, although you can combine it with visits to other places in Yilan as well. It's best visited on weekdays to avoid traffic jams on Fwy 5 to and from Taipei (on the weekend it's still doable but you might want to plan ahead to avoid certain hours).