You can be thrifty and take the bus to the C-train (light rapid transit) and ride that throughout the city so you can see the city!
Spend $60 and rent a car and spend time visiting the city or even, dare I suggest, a quick drive to Canmore or Banff (don't stop to pay, stay in the right lane) and see two of the most beautiful sights on earth!
You are in the lowest tax jurisdiction in Canada with the lowest fuel cost in the country, so go out and enjoy, beats sitting in the MLL!