It's easy to spend half a day in and around the National Museum of Natural Science (國立自然科學博物館, NMNS), one of the best and most child-friendly museums outside Taipei.
The major part of the museum is spread over three floors (including a basement level) and divided into a Life Science Hall, a Human Cultures Hall and a Global Environment Hall. Exhibition rooms focus on Taiwan's aborigines, Han Chinese religious practices, Chinese medicine, dinosaurs, local ecology, minerals as well as several other topics. The range of subjects should ensure no visitor feels bored.
Like Kaohsiung's National Science and Technology Museum, NMNS has both a 3D movie theater and an IMAX theater; see the museum's website for program details. Seeing a film costs NT$70 per person.
Admission is free on Wednesdays until 10am.
City buses nos. 71, 83 and 88 link Taichung TRA Station with the museum. Finding a spot to park a car near the museum isn't difficult on weekends. Parking in the museum's own underground lot costs NT$20 per hour.