Start at the top end of the car park by the information point and picnic tables, go through the small gate and follow the posts with a blue ring. Three trails start here together, so check the colour at each post: yellow is the short Deer Watch loop, and red is the Radnor Trail, which shares a lot of this route before carrying on south.
You start under Douglas firs planted in the 1860s that now stand over 50 m tall. Then you cross the Ornamental Drive to the platform, a raised deck looking over an open meadow ringed by oaks. Fallow deer graze there, but they're wild and nobody feeds them any more, so some days you get a herd and some days an empty field.
From the platform the path heads downhill on gravel, over two short footbridges by a little pond, and down a forest track to the low point, about 40 m below the car park. The way back climbs through mixed woodland and crosses the Ornamental Drive again. Most of it is easy going, but two short slopes are properly steep.