Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Medan (50% of total searches to North Sumatra). The next most popular destinations are Tuktuk Sonak (25%) and Berastagi (13%). Searches for hotels in Batang Serangan (13%) are also popular.
KAYAK users have found double rooms in North Sumatra for as cheap as C$ 8 (Medan) in the last 3 days. The average price is C$ 49.