1 Month Itinerary Recommendations? Day Trips?

How many nights have you allocated to each of the above cities?

Bologna is a perfect base for day trips to interesting cities around, such as Ravenna and Ferrara. Close by and easily done by frequent trains.

Venice (4 nights)
Bologna (4 nights)
Cinque Terre (5 nights)
Florence (4 nights)
Amalfi Coast (5 nights)
Rome (4 nights)

A second vote for Ravenna, and Assisi is also very nice.

With a trip as long as yours, I'd tend to want more time in Rome, and I'm not sure how you will fill all that Cinque Terre time unless you are beach oeople.

What time of year is your trip?

My suggestion would be to add two nights in Siena after Florence. But I think there are plenty of other good options depending on how you want to spend your time. Milan is a bigger city with some great museums. Como is a lake resort. Siena is rich in history with a real medieval feel. Turin might also tick a lot of your boxes. So I don't think you'll go wrong. Sounds like a great trip!

Congratulations on having so much time to spend in Italy.
Where are you flying into and out of? With the time allotted, flying into Milan and out of Rome would be good.
Are you adverse to renting a car for driving outside cities?
If you're going to Cinque Terre, have you considered skipping the Amalfi Coast as they're so much alike? Staying a few days at Lake Como would be great--on the Switzerland border 45 minutres north of Milan.
Have you considered staying a few days south of Florence in an agriturismo and visiting hill towns like Siena, Volterra, San Gimignano and Orvieto? Then catch the train into Rome from Orvieto.
Rome is a 4 day minimum stop. But there's also many great travel sites out in the Rome suburbs that most tourists skip.

Lucky folks, a whole month in Italy! You don't indicate which season or month you will be traveling, and the weather might influence how great certain locations might be. While it's excellent that you are settling in to each stop for a few nights, rather than having many one or two night stops, for me, 5 nights in Cinque Terre plus 5 nights in Sorrento would be too much of a good thing. I would reduce those. I have been to Verona a few times. When I went on day trips I found it very crowded, touristy and disappointing, but then I stayed for a few nights and enjoyed it immensely. Verona best combines an ancient city with a modern liveable atmosphere of any place in Italy that I have visited. Like many popular places, the best times to be there are early morning and evenings, when the many day trippers have left town, rather than being one of the day trippers. I love small towns in Italy, and would certainly recommend Siena (including in the evening), Ravenna and its mosaics, San Gimignano, Volterra, Assisi, Orvieto and others. Better to spend a night or two in a couple, than try to see them all as day trips. I like Naples, but not everyone does. It is a hectic urban city, but it has some excellent sites, including the Archeoloigy Museum with the best art from Pompeii, and some great food. The small Orsino46 B & B in Naples is wonderful if you can get a room there.

I agree that you have too much time in Amalfi Coast and the CT. We did 3 nights in Positano as a wind-down at the end of a trip and that was more than enough to enjoy it. I second the idea to add a couple of nights in Verona. It's kind of a long day trip from Venice, but doable (we did it in April) but I would have loved to spend a night or two there. It's just the right size, has the right feel, charm etc as a city for me.

I also agree Ravenna, at least as a day trip, the mosaics there were pretty spectacular.

Wow! This is all so helpful, thanks everyone. We're definitely thinking of reducing our time in Cinque Terre/Amalfi Coast since they are very similar. And to answer your questions - we're planning on leaving in late May! I have so much to think about now lol

I love a good long stay in the Cinque Terre on two conditions: you like to hike and it is not in July, August or Nov-Mar. I also happen to think the Sorrento stay of 5 nights is a very nice pace. You can see Naples as a day trip from there if you like. Rick Steves lays out a nice self-guided walk that you can combine with the Arch. Museum. I do think another night in Rome would not go amiss, but by the same token, a couple of nights in a Tuscan hill town is fun. One thing that strikes me as too long is 4 nights in Bologna, but if you can get to Ravenna for a day trip, it might break it up enough.

When are you going? In late autumn or early spring Cinque terre might be risky.
I love Turin, enjoy Naples (but do not drive there) .
I also like very much Siena and Perugia.

If you like Etruscan art And history go to Tarquinia.

Orvieto! One of my favorite towns. About an hour via train from Rome.

With a month to spend, flying in to Venice, and out of Rome, I would do this ...
3 nts Padova (Vicenza, Ferrara)
4 nts Bologna (Parma, Modena, Ravenna)
5 nts Tuscany (Pisa, Lucca, Siena, San Gimignano, Chianti, Montepulciano)
3 nts CInque Terre
3 nts Florence
3 nts Umbria (Orvieto, Assisi)
5 nts Amalfi (Sorrento, Positano, Capri, Pompeii, Naples)
4 nts Rome

Venice (4 nights) Bologna (4 nights) Cinque Terre (5 nights) Florence (4 nights) Amalfi Coast (5 nights) Rome (4 nights)

Venice - good place to start, and 3 full days gives you time to take it slow, get over the jetlag and see all the sights. Verona is better as a day trip from Bologna. The train ride is a little shorter, and, unless you're staying close the to train station, it will take more time to get to/from the station.

Bologna - great for day trips, not so much to see in the city, though I enjoyed just being there, walking through the streets. The University tour is well worth the time. Find a hotel that's about half-way between the center and the train station and you'll have a 10-minute walk to either. Ravenna is a little far with a lot to see so I'd try to plan for an overnight.

Florence - easy day trip to Siena by bus, Lucca (by train?). Pisa is an easy 1/2 day trip by train or stop on the way to the CT. There's luggage storage at the train station. If you haven't planned for day trips from Florence you may want to add a night or two.

Cinque Terre - 5 nights sounds like a lot to me. If you are planning on a lot of hiking, maybe not.

Amalfi Coast - How much time and where depends on what you want to do. Sorrento is the best base to visit Pompeii, Herculaneum, and even Naples (the National Archaeology Museum is a Wow) by train, Capri by ferry. It'll be mid to late June by the time you get there, take into account how much you think you can manage in the heat. You can also visit the AC towns (Ravello, Positano . . . ) by bus and return by ferry (that way you're walking down through the towns). Or you can split your time, partly in Sorrento, partly in an AC town, if you extend your stay to 6-7 nights.

The Cinque Terre have become very crowded in recent years and they are small. You may have a better trip if you spend less time in them and more in the AC.

Rome - 4 nights means 3 days for sights. That's not much at all in Rome.