In summer - it depends on if the weather is going to be a motivating factor for you.
if you want some sun, I'd aim for Croatia. Hot women, cheap, lots to look at, good food - not a lot of English speaking tourists.
If you don't care about having hot days every day, Scandinavia is beautiful, and the women are hot and friendly. And hot.
London in summer fills up with people terribly. I imagine Paris would too, but I've not been there in July-August.