The Slovak boat and ports (EN) company offers cruises within Bratislava, as a sightseeing tour, but there is also a possibility to go from Bratislava to Vienna by boat and enjoy the cruise on Danube. Here is a list of offered Danube criuses (EN) offered. They offer special cruises and parties on a boat, as well.
Getting there by public transport
The passenger port is located between two tram stops, from which it that takes no more 5 than minutes to approach the port. The tram stop is called Nám. Ľ. Štúra, where there is a tram stop only, and the second one is Šafárikovo nám., where there is also a bus stop.
Getting there on foot
As the port is located in the city center, it is easily approachable from every direction. If you walk by the bank of Danube, you will find it easily. It is a few hunderd meters away from the Old Bridge and the historical building of Slovak National Museum stands just beside.
Getting there by car
You need to get to the "Vajanského nábrežie" street. There is a turn to the "Fajnorovo nábrežie" street. You could try to find a place to park on this street, or continue to the end of the street. There is a paid parking service.