If you plan on staying for a week or more, we would definitely recommend renting a car. Kefalonia is a beautiful island and it would be a shame to miss out!
Our reccomendations:
Myrtos Beach - Rated the 3rd best beach in the whole world.
Melassini Lake - A lake in a cave which was discovered after a earthquake collapsed its roof.
Sami - This is the town which Captin Corelli's Mandolin was filmed.
Assos - Picturesque little village, take your camera! Nice spot for lunch.
Fiscardo - Quiet little fishing village. An hour's drive from Lassi. One of Chris's favourite places. The food here was amazing.
Our friends' recommendations:
Argostoli Town - This has been the capital of Kefalonia since 1757 and boasts a variety of entertainment from boutique shops and relaxing coffee shops to lively bars and beaches nearby. You can even see the sea turtles swimming around in the Marina.
Monastry of St Andreas - Just a 10 minute drive from Argostoli and definitely worth a visit. The damage from the 1953 earthquake unveiled older painted icons and is a fascinating place to visit.
Boat tours - Kefalonia is located in the Ionian and has plenty for you to explore not only by land, but also by sea. Take a look at http://www.kefalonia-cruises.gr/ to look at the boat trips available to you.
Our favourite places in/near Lassi:
Costa Costa Beach - Located just next to White Rocks Hotel. This is where you will find us most days!
Logos Cocktail Bar - A short uphill walk from the main road which runs through Lassi, this is perfect for drinking cocktails while the sun sets.
Argostoli - The capital. Head to the main square for a meal one evening or get up early one morning to see the turtules by the marina.
Lassi Water Wheel - I understand that here the sea water gets pasts through the water wheel through the caves, forming a nearly complete fresh water lake at the other side of the island in Sami.
Lassi Lighthouse - Take your camera!