Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Toronto (83% of total searches to Lake Ontario). The next most popular destinations are Mississauga (8%) and Kingston (5%). Searches for hotels in Niagara-on-the-Lake (4%) are also popular.
KAYAK users have found double rooms in Lake Ontario for as cheap as C$ 44 (Toronto) in the last 3 days. The average price is C$ 336.