While Porto is a walkable city, there may be instances where public transportation or other forms of transportation are necessary. The city's hilly terrain, particularly in specific neighborhoods like Foz or Miragaia, may require additional modes of transportation if you prefer to avoid steep inclines. However, Porto's attractions and points of interest are easily accessible on foot, especially in the city center and along the riverfront. Public transportation options such as buses, trams, and the metro system are also available. They can be used to reach slightly farther away destinations or explore areas outside the city center. Ultimately, the choice to walk or use other means of transportation in Porto depends on personal preference, physical ability, and the specific locations you wish to visit.