This applies to Vernazza, too, which some consider to be the most crowded town in the Cinque Terre. However, Rick Steves writes on his website that the tour groups don't stick around for long.

The trail that connects Monterosso to Vernazza is a beautiful yet challenging ... To find the trailhead, head to the eastern part of the old town of Monterosso and look for the small footpath ...

Vernazza is often credited as the most picture ... During peak season, recent travelers say this little town is packed with tourists; they suggest visiting in the morning to avoid the thickest ...

Each of the five villages - Monterosso al Mare, Vernazza, Corniglia, Manarola, and Riomaggiore - has its own charm. They are all also connected by scenic hiking trails and a convenient train line.