Last weekend I went to walk at Taman Putra Perdana,next to Shangrila Hotel over looking the PM Office.I saw at least 50 cars and a lot of people were there walking and at children playgrounds.
Words of caustion here: some walking paths are quite sloping and I felt some pains on my old joints.If you are young it is okay.For those around 50+,it is better to walk on flatter terrain like boardwalk at Kelab Tasik(P8).The path is narrow and not suitable for cycling unless you are 10 years old and below..
If you wish to savour a changing scenic views by the lakes,just take a walk around the Core Island.I did it with my son and it took me 2 hours for a distance of 10km.