Wow, it's not a bad idea to buy yourself a piece of land in such a great place near the sea. I am very jealous of you because you can build yourself anything, and I live in my apartment so even without going to the sea. But let's not talk about the bad, I want to advise the site Greece Invest https://greece-invest.com/greece/halkidiki/lands where I bought my apartment and here you can buy a whole plot.