The Rangers Gate. Not really a highlight, but the best place to enter the Park itself. In dry weather you can get to this gate by grit paths from Windsor, starting just by Windsor Football Club car park. This avoids the main, busy road that crosses through the Great Park.
Unfortunately, the adjacent car-park is no longer free. Use the Review Ground, Aero-modellers', Queen Anne's Gate or football club car-parks. They are all free and connected by tracks (of varying surfaces) to this entrance.