Are you looking for things to do this weekend in DuPage County? With Halloween approaching and the trees beginning to change colors for the fall, we put together a list for you.   Troll Hunt and Cider and Ale Fest at the Arboretum Visit the Arboretum this weekend for the Troll Hunt, Scarecrow Trail and see the leaves begin to change colors. Journey through our far-reaching forest to hunt for six colossal trolls. Marvel at these 15- to 30-foot-tall (and one 60-foot long) sculptures that have been created to serve as protectors of our environment. Sample ciders and seasonal beers in the midst of rich fall color at the Cider and Ale Festival on Saturday. Sip on local favorites and explore new craft ciders and beers while enjoying the beautiful…