Can I get to Płock from Warsaw by boat?

Or could you send me a link to a website where I can get info about Wisła tourist boats?

there are no boat trips between Płock and Warszawa

No, but by horse, why not?

only if you don't have a car (kidding)

But I have definitively read somewhere, that there are 7 days long trips by boat.

The last boat trip to Warsaw

It is record low now in Wisla , 68 cm! - Warsaw