First time in Singapore for 3 full days , how should we plan our itinerary?

Scenario:
We will arrive on thursday evening and leaving on monday morning.There will be five of us staying at the Negara hotel orchard.
This will be our first time in singapore . We want to do some shopping, get some tailored clothes made as well as sightseeing in chinatown, little india, botanic garden, raffles hotel, boat quay, night safari and sentosa .
How we should plan our itineraries?

Suggestions:
Get your clothes measured first on Friday morning. Followed by the 3.30pm sentosa sunset while the tailors are stitching away at your clothes.

The sentosa coach will take you all the way up the mountain which is the mount faber where you will go on the cable car across to sentosa island as the sun goes down.
Meal outlets are available on Sentosa island .

After breakfast on saturday , go for the morning city tour as the weather is not as hot and humid as in the afternoon.

This will cover chinatown, little india, botanic garden and gives you a good bearing of places you want to see.

After the city tour, shopping will be much easier as you already know your way around the city and where the best bargains are and save you time finding your way around on your own.

Just off orchard road, there are some good reflexology and spa centres for you to relieve travel fatigue .

In the evening , when the traffic in city is bumper to bumper , take the trip to the night safari and escape far from orchard road traffic.

Have your meal first before the night safari 6.30pm pick up .

However if you find it too early for dinner, many food outlets are available at the night safari. We can organize dinner for you at the night safari , at your request.

The coach will drop you back at the hotel around 11.pm and you should have your tailored made clothes delivered by now.

The malls are still open Sundays. So you can continue to shop followed by shopping at the night market in the evening and dine by the river at boat quay as the city skyline glitters in the background.