We were in Italy this past September/October, including parts of Tuscany, Umbria, and the Cinque Terre. Based on this latest trip, I’d say see more Tuscany, plus Orvieto in southwestern Umbria. It’s on your way to Rome, in addition to being a very worthwhile visit. See it especially earlier and later, before the 11AM crowds arrive, and after they leave at 4PM. It’s one of many highlight hill towns in Tuscany.
Assisi had some bright spots, although it was frustrating in a lot of ways, and definitely not the favorite part of the trip. Getting buzzed by traffic was unnerving, and it was the least pedestrian-friendly town the whole trip - including Rome! If you’re seeking it for spiritual reasons, maybe it’s a must-do, but I’d really pick Tuscan locations over Assisi.
Cinque was our second time there, after the first one in June 2001. Frankly, it was disappointing in some ways, compared with 20 years ago. Way more crowded now, and while there were outstanding restaurants and gelato places (definitely go to Gelateria Alberto in Corniglia!), others were a let-down. Maybe June is still a better time to go. The overall vibe 2 months ago was decidedly less welcoming. In addition, recent storms had closed some hiking trails for an undetermined time, which put everybody on just a couple paths. Some hikers weren’t good about sharing the limited trail spaces, and it seemed like being in a subway at rush hour. Being pushing and elbowed wasn’t a fantastic vacation atmosphere. Maybe go to the 5 Terre at least once in your life, but we might not be going back again.