Portovenere.  The bus line to Portovenere is the 11/P (duration: about 30 minutes, cost 3 euros). One bus every 10-30 minutes. just walk across towards the funky church opposite the cruise terminal. Bus stop 🚏 is by the colonnades. Get your tickets from the tabacchi on your right as you look at the colonnade ( green awning I think)