One of your first stops should be Quinta do Panascal Visitors Center. Here, you'll be able to orient yourself and get lots of useful information before you set out exploring.
When you've finished exploring this tourist information center in Tabuaço, why not make your way to Viewpoint of St Leonardo da Galafura, Quinta da Roêda Winery, and Quinta do Popa? They're not far from Quinta do Panascal Visitor's Center and also a favorite with many travelers.