We found the Cinque Terre coastal hiking trail too ctowded to be enjoyable 10 year ago, and I believe it has only gotten worse. We did enjoy the quiet early morning and evening times in Manarola, but after one day of hiking from there to Vernazza we gave up on the popular SientireomAbruzzo and t hiked the steeper trails in the hills above. That was too hot, so we gave up and spent the rest of the day swimming off the rocks. It is not a place I would visit again.
But the Lakes should be nice for your interests. You did not include Lago Maggiore, but I will mention the opportunities there. We will be spending a September week in a small town on the lake, with guided guided hiking provided by HF Holidays, a UK-based cooperative that focuses on walking holidays in the UK and around the world. The holiday includes lodging, meals, walks at 2 levels each day, and transport to or from the trailheads. Plus the camaraderie of other guest at meals and on the hikes. Non-members are welcome with a small supplemental fee. They are offering two sessions in May of next year, beginning May 10 and May 17.
Take a look at the photo gallery:
https://www.hfholidays.co.uk/holidays-and-tours/the-best-of-lake-maggiore-walking-holiday
We are combining this with a week on our own at Lago di Garda. You could do something similar, adding places like Verona, the hill town of Bergamo, or Ravenna with its beautiful mosaics. All more worthy of one’s time than Cinque Terre, in our opinion.