We are staying on the Dam near Centraal station how do you get to the Showboat from there and how long does it take by public transit or taxi?

Try their web site, www.showboat.nl

Take the train to station Zaandam ( www.ns.nl for time schedule )

Transfer to bus 88 in front of the station

Ask the driver for bus stop Koperslagerstraat

The Showboat is moored on the right-hand side after 75 meters
or take a taxi from the Station in Zaandam

Or from Station, it is a 10-15 minute walk. When you come out of the station, turn right and walk along the main road. About 1.5 miles down, the road bends towards the right and after a few yards, you will see the Showboat on your left hand side.

Hope that helps.

Best option is take a cab from the Zaandam station, cost you about 10 euro and takes 5 mins.