C'était trés bien
très jolie musique
"C'est très bien ici"
You don't, it's never a pleasure meeting somebody who's French.
Ses amies sont très polies.
"vous avez un corps magnifique"
I have no clue but I would search for a translation site on google.
you say 'agréable'.
'your the nice one' in french is 'votre la belle'.
In French, 'bon voyage' means 'have a nice journey'.
Vous êtez tres (good) bien or (beautiful) jolie
passe une bonne Saint-Valentin (very odd thing to say in France)
In French, you can say "Très joli derrière" to mean "Very nice butt." Another casual way to express it is "Très beau cul." Keep in mind that the context and the audience matter, as some phrases can be more informal or potentially offensive.