If you are looking to learn about the region's history, one of the best fun things to do in Allentown PA is visit the Lehigh Valley Heritage Center. If you are looking for the best things to do around Allentown, PA, the Lehigh Valley Zoo is one that you do not want to miss. If amusement parks are your jam, you will not want to miss Dorney Park, which is certainly one of the best family-friendly things to do in Allentown, PA. Allentown and the Lehigh Valley also have a lot of outdoor activities, such as hiking, biking, and boating, as well as a few amusement parks that are fun for all ages.