Who says that no family activity in Singapore is cheap? Think again! In fact, some of them are FREE! From free shows to art appreciation, here are 5 Family Activities (under $10) that you will surely enjoy. 1. STARGAZING Be amazed by the stars and constellations you will see in the Omni Theatre at the Singapore Science Centre. Gaze over the vast universe from 7:50 to 10 pm every Fridays through a series of telescopes. Best of all? It’s FREE. 2.