Century Gardens is a peaceful spot to take a breather. Have a picnic, wander around the grounds or just lie on the grass and shut your eyes for a while.
You're spoiled for sightseeing choice when in Downtown Calgary. Century Gardens is a good place to begin here, but there are lots of other worthy sights to discover. Calgary Tower, University of Calgary, and Scotiabank Saddledome are close to the recreation and green space and will fill in your day nicely.