For those of you who don't like hiking trails, but would rather bike a trail, the Cinque Terre (and surrounding) offer a fairly new option.
The trail Levanto-Bonassola-Framura opened last year and is all flat (on a former old rail line). From Levanto one can even go over Monterosso, but in that case there are some hills, so it's more challenging.
I like Bonassola a lot (more than Levanto) and I presume it's still not totally invaded by the Rick Steves' tribes yet, so it offers a good alternative to staying at the Cinque Terre proper. From Bonassola to Monterosso it's less than 10 min by train.
http://www.bellitaliainbici.it/framura_levanto.htm
(Italian only, but beautiful pictures)