Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Porto (95% of total searches to Northern Portugal). The next most popular destinations are Braga (2%) and Vila Nova de Gaia (2%). Searches for hotels in Maia (Porto) (1%) are also popular.
KAYAK users have found double rooms in Northern Portugal for as cheap as C$ 24 (Porto) in the last 3 days. The average price is C$ 223.