The average adult walking speed is 4.3 km/h. In a half-hour, you can cover over 2 km.
If your 2 km. drive to campus took ten minutes (including finding parking, and walking to your building), for an investment of an additional 20-minutes, you get 30 minutes of exercise, save the cost of gas, parking and wear and tear on your vehicle, and don't need to pay for parking.
Visit the UVic Travel Choices website for extensive information on walking to, from and within campus.