I know there are tons of places to hike in Italy. Unfortunately, I didn't have time to do much. However, there is one that I had the opportunity to do and that I loved. It is the one that allows you to visit the Cinque-Terre. Some portions of the trail are very easy to walk, like the paved section from Riomaggiore to Manarola, and other sections go up and over hills with spectacular views along the coast. It takes around 5 hours to travel the entire distance, not including time to explore each city.
I wish I'll be able to do it again soon.