Singapore
Got a long stopover in Singapore? If you are staying more than four hours, you can take a trip into Singapore (it's not so big, so you can zip in and out of the city). However, if you have a touch longer, you could visit one of the many spas in the city (you can find many in the top hotels). High standards, and relatively inexpensive, it will certainly leave you refreshed for the next leg of your journey.
Jump on a taxi from the airport, make sure you check with your airline first to see if you have enough time
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