I have a simple and elegant solution: all visitors of the Sembawang Hot Spring must be nude. This will weed out the brats and their concerned parents, and those low SES gian png Sinkies who are offended by others showing skin. You bring nothing in, and you wear nothing. Some lockers can be provided for visitors to deposit their barang-barang.
With a lower number of visitors, those attendants working there can manage the place much more easily. Essentially, they will become 'bouncers' whose main role is to keep an eye on any potential unruly person disturbing other people. That person will be evicted and placed on a blacklist, and banned from entering next time.
So easy also dunno. Sad!