Halkidiki is like heaven! For me, it has the best beaches and landscapes in northern Greece. Sithonia is a fantastic area. Just take care of your forests, because I was very sad to see that some of them were burnt down. The beaches of Halkidiki are gorgeous, my best is Lagomandra. Also Kassandra is nice village but something should be done with the traffic. Cars are stuck together for several minutes and this causes tension and spoils your vacation, doesn't it? Taverns are also wonderful , every time I go, I get a few kilos!!