This pine covered island is totally undeveloped. The catamaran from Dubrovnik drops you at the tiny town of Polace which has remains of a Roman palace. Here you can hire a bicycle to explore the quiet roads and reach the lake with an islet that is home to a 12th century Benedictine monastery. This is now a restaurant and served by a little boat so that you can treat yourself to a seafood lunch. Swimming in the clear blue lake is a great way to cool down.
www.mljettravel.com
Mljet island is 90 minutes by catamaran from Dubrovnik
Google map: bit.ly/LFjAcV