What are genuinely good cheap things to do on weekends in SG?

Born and raised here, my go-to cheap weekend list that's actually good, not just "go park" filler: 1) The green corridors and connectors, the Rail Corridor end to end, or cycling the park connector network (PCN) from say East Coast all the way round, rent bikes cheap or use your own, it's a proper half-day out for free. 2) Southern Ridges walk (Henderson Waves etc), gorgeous and free. 3) The free museums, many national museums have free entry for citizens/PRs, great for a hot afternoon. 4) Pulau Ubin day trip, cheap bumboat over, rent a bike, feels like old Singapore, brings you back. 5) Hawker centre food adventures, pick a famous hawker centre you've never been to and just eat your way through, a whole experience for under $15. 6) Library programmes, the public libraries run free talks, kids activities, and it's aircon and free. 7) Sungei Buloh or the reservoirs for nature. 8) Free community events, check your CC (community centre) and the arts calendar, there are constant free performances and festivals. The trick is Singapore has TONS of free stuff, you just have to look past the malls. Nature + hawker food + free museums fills every weekend cheaply.

Pulau Ubin is my top rec, genuinely feels like a mini holiday for the price of a bumboat ride. Bring water, rent a bike, explore the Chek Jawa wetlands. Half a day, costs almost nothing, and you totally forget you're in SG. We take visitors there and they love it more than the expensive touristy stuff. Underrated gem.

Follow the free festival and event calendars, there's something almost every weekend, light-ups, night festivals, cultural celebrations in the ethnic precincts, free outdoor concerts at the Esplanade. All free, all lively. Also many attractions have citizen/resident discounts or free days, worth checking before assuming you must pay full price. SG rewards people who do a bit of homework.

Sunrise or sunset spots cost nothing and beat any mall. Marina Barrage for a picnic and flying kites, Mount Faber for the view, Marina East. Pack your own food from the hawker or supermarket, bring a mat. A picnic with a good view is peak cheap SG weekend and honestly more memorable than another aircon mall trip. Nature is the best free entertainment here.