What are your favourite free, outdoor playgrounds in Singapore?

Just went to Marine Cove at East Coast Park. I think it's lovely!!! Wide open spaces with lots of playground themes for the kiddos to explore. Parents get to relax at the side. But if I've got 1 complaint, there's way too few shelters! It's scorching hot even at 4pm. Nevertheless, little one had a good sweat and was able to utilise most of his energy.