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...or maybe Singapore Slings at the Long Bar at the Raffles Hotel. Touristy? Yes, but you're a tourist.
I guess taxi fare to Changi from Boat Quay is about S$20. (S$25 the other way.) Fare increases by 50% after midnight (but taxis then become easy to get), and there are added fees for booking a cab, entering the central business district, rides during peak hours, and the ride originating at the airport.
It's ungodly touristy, and expensive, but one could argue that it's a one-time must do. If going, dress in appropriate attire. You won't get past security in shorts and a T-shirt.
Regards,
DocVikingo
The dress code is my only concern.