Many students find an actual visit to the campus extremely helpful. There are many schools - big, small, urban, suburban, and rural - within a two hour drive of Philadelphia. Visiting various college campuses can help you get a feel about what you like and don't like about a campus.
Colleges also expect prospective applicants during the summer months. The admissions' offices generally run tours throughout the day. You can call and sign up, or just drop in. If you wish to interview (many schools do not do on-campus interviews), call well in advance. Interviewing schedules and procedures vary. Call the school for specific information.
You should also contact HGP alumni on the various campuses you wish to visit. If it is difficult for you to visit campuses, most colleges and universities now have web sites which enable you to take a "virtual tour." Once you have assessed what you want, obtained information and consulted with your college counselor and parents, you are ready to narrow the field of choices.