What exterior remodeling projects provide the best curb appeal for a quick sale?

The inside of our home is in great shape, but the outside looks a little tired and weathered. We have old vinyl siding, an outdated front door, and overgrown landscaping. I know first impressions are everything when buyers pull up to the driveway. What are the most effective exterior upgrades we can tackle to make the house stand out in listing photos and in person?