Cruise Ship Stopping in Ravenna

Here is one option

https://www.toursbylocals.com/shoreexcursiontovenicefromravenna

That tour ends in Venice; it doesn't provide transportation back to Ravenna. It's quite likely that it doesn't get tour members back to the bus station early enough for them to return to Ravenna on time. The tour doesn't seem to do much except provide a walk from the bus station to Rialto and Piazza San Marco, a ride down the Grand Canal and a trip to Murano, the glass island. It's highly likely time is spent in a Murano sales room so the guide can collect a commission. I love glass, but I would never recommend Murano to a non-glass-collecting visitor who had only part of a day in Venice. I think going inside San Marco would be a lot more important. After that, I'd suggest a walking tour of some of the less touristy areas. Folks very interested in modern art should see the Guggenheim Collection.

Won't argue against Venice, but I would love to see the Byzantine mosaics in Ravenna
https://www.thegeographicalcure.com/post/guide-to-mosaics-in-ravenna
https://www.timetravelturtle.com/ravenna-mosaics-italy/

Forget Venice until you can give it more than a few hours. Lots to see in Ravenna, the incredible mosaics being a major attraction. There is also a great market but it does close at noon or 1 pm. Great to buy goodies for lunch there. The main piazza has a variety of restaurants as well. I liked Ravenna a lot.

Ravenna is quite wonderful - I, too, recommend staying there and touring the Byzantine mosaics. If you were to visit Venice instead, you would be spending at least five hours in transit round-trip.

Another vote for Ravenna. I spent two days there in September and didn't run out of things to see. I admit to loving mosaics, but Ravenna's (UNESCO-listed) are some of the world's most spectacular.

I agree with above

Ravenna is lovely and the mosaics are fabulous
We just spent 2 nights there, enjoyed it very much and I’m glad we’ve been there before the cruise crowds ruin it

While I love Venice it needs more than a few hours to experience and it’s simply too much time in transit