1) Stop subsidizing cheap oil: Cut the miltary budget and stop building roads.
2) Tax property according to lot size rather than value. This would naturally encourage a more efficient use of space without penalizing improvements. Such a tax would prevent the hoarding of land, keeping more of it available for the free enjoyment of all. It could be available at two rates: a higher rate preventing free passage (homes, etc.) and a lower rate allowing free passage (farms, etc.). Land on which tax isn't paid would be freely occupied and therefore difficult to develop.
NOTE: This plan is organic, so it would take a few years before we see the ultimate result: a quiet, harmonious city with bicycle paths (possibly golf carts, too) meandering through quaint peaceful neighborhoods with small businesses and houses.