This is my second favourite viewpoint in Vernazza, however it's the best to get a picture as you have Vernazza perfectly placed on the background.

To reach this spot you have to do the hike trail between Monterosso al Mare and Vernazza and you need a ticket in order to do this trail. However, if you get the Cinque Terre Pass, which includes trains and hikes between towns. With the pass you don't have to pay extra if you want to reach this spot. I recommend the pass anyway as it's super useful