This is your last day in the city. So, make sure you don't get exhausted during this day. Choose to explore the ever-famous Gardens by the Bay on your last day. Educate your kids about the specialities here, and let them explore the Supertree Grove, magical biodomes and every other element as well.
Clark Quay is also a place you may cover on your last day, and if time permits, enjoy a river cruise as well. You will find a lot of tourists here, but this area is surely worth visiting when you are in Singapore.
With this, you have covered the must visit attractions in Sigapore, and you may end your family tour with a bunch of beautiful and happy memories.