Here is a little mapping exercise for you to try out, preferably with a 1:50,000 topographic map.
With your home at the centre select an area up to 20kmx20km, that's 400sq kms. Not as big an area as one may think! Those of you near large bodies of water will have to improvise. Next count off those kilometre squares that have public access, e.g. roads, public footpaths etc then count off which of those squares you have visited either by foot, bike, car etc and work out the %. This isn't a competition just a way to motivate you all to see more of your local area.
Could 2004 be the year you decide to visit more of those squares? You might be surprised at what you find.