We plan to spend two nights in Vernazza after four nights in Venice. We would have one full day to explore Cinque Terre given it will take awhile to arrive to Vernazza (we are not early morning people). I see a 10.5 hours day trip tour from Florence to Cinque Terre and maybe consider this option. Please share your experience about the tour. http://www.italy.artviva.com/tours/185/ .
Much thanks for your suggestions.