Take the M3 to J4 and take the A321 north towards Camberley. Follow the A321 for around 2.5 miles through Camberley until you see Sandhurst Memorial Park on your left. Take the first left (Yorktown Road) and follow for around 300m until you see the car park on your left.
Approx 1.5 miles walk along the river from Blackwater Station.