German!
I like German too: in my case it is for linguistic reasons mainly, as I love seeing the Germanic roots in both English and Yorkshire dialect. I learned it in Austria, and love their cuisine, as it is heavily influenced by the East, from the Austro-Hungarian Empire times.
But French too has a huge attraction to me: it sounds so beautiful, but alas my mind doesn't work as fast as French people speak it these days! Mind you, it would only take a week or two in an entirely French speaking environment for it to come back. Meanwhile, in a situation that is totally alien to my character, I can only understand very posh French speakers!
The other language I learned is Latin: but ancient Romans are hard to come by to practice it, and as I took my O levels 53 years ago, not much is left! I do love the language though, and it used to make me feel great to be reading things as they were written 2000 years ago or more. It was also Latin that enabled me to understand English grammar, and German grammar for that matter. In fact after Latin, English grammar is so very simple, and German grammar is bearable.
I'd like to learn a totally different language, one not on the indo European language tree, but I haven't got round to choosing one. Cantonese would be a good choice, as my DiL is a Cantonese Australian.