Sentosa and safari in one night, is it doable?

Scenario:
Hi, we will be coming from Malaysia and arrive in Singapore in the early morning. We will be leaving the next day later in the evening around 9 pm. We plan to see the city , night safari and sentosa musical fountain. What’s the best way of doing it?
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Suggestions:
You only have one night. Both night safari and musical fountain shows are at night. Musical fountain first show ends at around 8.30 pm .

Musical fountain is on Sentosa Island which is the southern most tip of Singapore. Whereas the Night Safari is at the northern most tip near the border between Malaysia and Singapore.

It will be very rush if you do both on the same night without a prearranged transfer to take you direct from Sentosa to the Night Safari
So prearrange the tickets and book the transfer before hand to save you the time.
Any further assistant , let us know.