I happen to know this place when I first came to Kuala Lumpur, and it have been a common place for weekend activity for quite some time until now. It just lately, I could not spend more time. One of the best thing about the place is the people. Everyone were accommodating, and friendly, not forget to mention about the kids there.
Gua Damai located north side of Batu Caves, near Kampung Melayu Wira Damai. Coordinate: 3.2477904, 101.687463. Last few month, I have the chance to spend some evening there, at the place, and did some bouldering with the kids, and of course, cycling. 🙂 Here are some pictures