re: London

This is quite vague, but alongside the River Thames there are quite a few boats that are actually bars. Pretty sure the place I went was was called Hispinola near Embankment tube station.

You can grab a meal below deck then sit on the boat with a drink. At night its really good as you have a view of the Houses of Parliament, the eye etc. all lit up in the night sky.

If you are by yourself there are usually some smoking hot womenz there, and if you are with a wife/gf etc. it can be romantic(actually found out its where my dad took my step mum on their first date), although its not somewhere to go with kids.