Philadelphia's Upper North district is a huge area north of Lehigh Ave and northeast of Front St. This isn't the most visited part of town, but nonetheless there are plenty of interesting neighborhoods to explore.
Manayunk is known as the "city on a hill," home to many unique stores and shops as well as a thriving student and artist community. Manayunk also hosts an annual Arts Fest and the main climb for the Philadelphia International Cycling Championship in summer months.
East Falls is home to Philadelphia University, Drexel University College of Medicine, and Women's Medical College (the first women's medical school in the world), which is currently being renovated into a mixed-used development by a team that includes Philadelphia's own Wulff Architects. The end of Kelly Drive culminates at East Falls; take the bridge over the Schuylkill River to MLK Drive to continue your 8 mile bike ride back down to the Art Museum.
The Far Northeast is the farthest north you can get in Philadelphia without leaving the city, this section is mostly residential with some light industrial parks. The Pennypack portions of Fairmount Park run through the Northeast and the Far Northeast.
Mt. Airy is a residential neighborhood that could be described as eclectic, with its main streets crossing at the site of a natural food co-op. Young families tend to live here on many tree-lined streets.
Chestnut Hill is the next neighborhood west from Mt. Airy along Germantown Ave, Chestnut Hill is largely a leafy residential neighborhood that could has, historically, been associated with wealth (although I believe Rittenhouse has supplanted it in home prices. It has a bustling main st complete with restaurants, a hotel, a farmer's market, bakeries, and plenty of stores. It feels like a charming small town in the middle of the city.
The Northeast is notable for bargain shopping, Northeast Philadelphia is home to Franklin Mills Mall, with many popular brands having large outlet stores there
Port Richmond is Largely populated by people of Polish decent. Known for various Polish businesses as well as restaurants. This section of the city is known for its authentic Polish cuisine. Many different grade schools, public and parochial, are in Port Richmond. This area of the city is very convenient to Center City, Olde City, South Philly, the Northeast, as well as New Jersey via the Betsy Ross Bridge. Access to the El as well as the trolley and bus routes also make this area a great place to live and commute to different areas of the city. Affordable housing is also a perk of the Port Richmond area. This neighborhood is made up of mostly row homes and various types of apartments. Many businesses thrive along Aramingo Ave., which is a heavy populated avenue in this neighborhood