Croatia
A short ferry ride from Dubrovnik, Mljet, which comprises a stunning national park and lakes, is perfect for a day trip. You can swim in the freshwater lakes, walk and cycle round them or get something to eat at the beautifully preserved monastery. A steep hill separates the lakes from the ferry port, so if you're planning to cycle it's a good idea to use the mini-bus service included in the park entrance fee, and then hire bikes at the lakes themselves.
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