Disraeli should consider renting a car or taking domestic flights to maximize their time and cover the large distances between destinations. The estimated travel costs would range from $400-800 depending on the mode of transportation chosen and the distance covered.
If you have more time, consider adding a visit to the stunning Gaspe Peninsula or spending a few extra days in Montreal and indulging in the city's renowned food scene. If you have less time, consider skipping Prince Edward County or Gatineau Park and allocating more time to exploring Quebec City or Toronto.