There's nothing like relaxing by the water while you're on vacation. Take a picnic to Melissani Cave Lake and then stick around for a pretty sunset.
If you're planning to stick around a while in Kefalonia, Melissani Cave Lake is a good place to start your exploring. This body of water is one of many attractions that'll keep you on the go here. Antisamos Beach, Karavomilos Beach, and Acropolis of Sami are also waiting to be explored close by.