u/Extension-Dig2420

I'm travelling on my own to Skiathos in 2 weeks time. I lost my friend I used to holiday with 10 years ago and it's the first time I've been back to a Greek Island since then. I've had one or two holidays on my own and the part I find hardest is eating out on my own. Has anyone any tips on the best way round it? I'm also concerned about leaving any valuables, like my phone on the beach if I go for a swim in the sea.