Grab your bike and explore the cycleways in your city! This is a great way to exercise, explore and have fun with stops along the way at cafes, galleries and parks. Navigate the area in a completely different way and get an appreciation of what it's like to travel by bike.
To do this, I use a combination of local cycling maps and Google Maps (bike travel view) to plot out a good route that is off the road, on shared paths or dedicated cycleways. Try to explore a different route each time and then you can come back to your favourites.
If you don't own a bike, look into hiring a bike for several hours or a whole day. Even if you own a bike, you might not want to transport the bike to where your route starts (e.g. into the CBD), so look up whether there are some handy bike hires in the area already.