A taxi to your hotel in Quebec has a standard fare from Jean Lesage International Airport.
As of late 2006, it cost CAD $30.00 (I think... cannot remember exactly but it's a set fare)... I suppose a tip is necessary also. As the temperature was about -3 degrees celcius when I had arrived, I chose to get a taxi and just get to my hotel to warm up. The driver was very nice, talked about the city and informed me where certain things are located, etc.