From the airport
From the Schiphol Airport, travel by taxi (approximately €60)
Train: Catch a train at the Schiphol railway station, and travel approximately 8 minutes to the Amsterdam Zuid Station. From here, you can take a tram to the Museum Square. You also have the possibility to travel by bus from Schiphol Aiport, to the Museum Square. It's cost 4.2€.
Taxi: It's a 20 minute trip and is around 60€.