Go if you have a few days to spend in Hanoi, but if you have less time there are more important attractions that should take president.
Go on a sunny day. We took a taxi to the botanical gardens next to the lake. 60,000vnd. Gardens 2000vnd. Worth an hour or so visit away from the traffic. Then walked along the lake side anti-clockwise to the intercontinental hotel. Enjoyed the sunset at their beautiful 5star sunset bar. Pricey (beer 70000), but between 5and7pm its happy hour= buy one and get one free. Take bug repellent.
Nice relaxing day out.
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