Interesting northern Italy suggestions

It's a bit of a trek from Bologna (three hours, I think?) but Trieste is lovely.

Senigallia and Fano are two cute seaside towns on the Adriatic. It's not really off the beaten path, but I hope to get to Ravenna one day to see the mosaics. Chioggia has always sounded interesting to me as well, but I don't know the transit details.
Hiking and bus/train access can be difficult, but there is a lovely park just north of Pesaro called San Bartolo. I wonder if bus access would get you there.
What is your starting point?

We enjoyed our stay in Camogli - It's a beautiful, relaxed village on the coast and the restaurants there were really great! Lots of excellent seafood and focaccia - don't know if that's too far to travel from Bologna. We did several nice hikes from there (one to Recco for more focaccia and gelato). There was a tribute to the Beatles performance at the local theater - we went and it was so much fun!

There is a train station in Camogli and you like larger cities, you can easily do a day trip to Genoa for a visit to the large food market, shopping and more. It's a really interesting city!

There is lots to explore along that coastline - from Camogli we also went to Santa Margherita Ligure, and Portofino - especially Portofino was really crowded - we weren't impressed.

Just remembering this trip makes me happy! I'm thinking of the beautiful sunsets at the end of each day!

Thank you for your suggestions. I started in the Rome area, to Abruzzo (first time there) and then a stop in two favorite places Firenze and Cinque Terre before heading north for a week. Thanks for any and all suggestions. :)

Is everything already booked? You might want to play around with the order a bit if possible. My suggestions in Marche might work better after Abruzzo. If the order cannot be changed, then I think something in Liguria would work well (like the suggestion above for Camogli).

Thanks was thinking something maybe by the lakes or the link someone was talking on another question looks nice.
https://www.agriturismomarciano.it/index_en.html

Agriturismi are generally difficult without a car. As I understand it, Lake Como is easy without one, and you could easily do Florence-Milan (to access the lakes)-Bologna.

Look at Ravenna. It's an easy trip from Bologna, has astonishing mosaics, it's on the coast, not tourist blitzed, and it has a pleasant atmosphere. If that's not enough cred, consider
-It was the capital of the Western Roman Empire in the 5th century ad and later (6th–8th century).
-There are 8 UNESCO World Heritage sites.
-The world's two most famous mosaics -- of Emperor Justinian and Empress Theodora -- are here.

Other than cities, the only place in Italy we didn’t ever rent a car, four trips there, is Lake Como. The ferry system will transport you all over this beautiful lake.

thanks everyone :)