Yes! Singapore have 2 hot spring spots! This is the only one open to public and it is free, the other hot spring is located in the military island that is not open to public.
The hot spring park open from 7am to 7pm, it is very near to the Singapore Zoo, about 15min drive only.
Singapore is a hot and humid island, it might sound crazy to enjoy hot spring in a hot day but trust me, you will love the mineral from the spring water making your skin smooooooth like baby.