Hi.. hi ~
umm.. it depends, actually
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I need to know first the tourist's characteristics. He/She likes foods, scenery, luxury, or what?
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But mostly, people from Indonesia like to go to Sentosa Island and Marina Bay, or perhaps walking around Esplanade to take some pictures with the Merlion. Those places are free to be visited though. For Sentosa Island, as long as you don't go to enter anything there, it will only cost u for transport

(either by bus, train, or sky train).
If you liked to go shopping, can try spending time at Bugis Street
Actually there are still a lot more of cool places in Singapore

ya.. again.., it depends on the person itself, what does he/she like. But trully say, if you quite often already visiting Singapore, you will feel that Singapore is very small, and maybe you would like to go to Johor or any other states around Singapore.