River Boat Cruise Disemarks Venice

I like Hotel Tivoli in Venice. You may find what you want in booking.com. I've had good experiences finding hotels with them.

Are you sure that the boat finishes in what you would expect to be Venice?

I expect it to end at the mouth of the Brenta near Chioggia, or the canal near Fusina. Neither of those are near the islands of Venice.

You might ask your tour company how (or if) they get you to Venice, and if so then any accommodation would be close. If they don't, you will want to get there yourself because staying near the end would not necessarily be what you would want.....

Assuming you mean a cruise on the Brenta.

If it is the Po, that is further still. Which river will you be on?