I want to learn Dutch.

You should definitely take it in university too. I'm taking German and it's an easy 3 credits towards the 36 credits I need outside my major. And German and English are both Germanic languages, as is Dutch, so the differences aren't too great.

I'm more worried about it being too much extra work on top of what I'm already doing (Which will be 3rd year physics, topped off with a little 2nd/3rd year maths). But I will have a look into the available papers.

EDIT: Apparently it's not offered here anyway XD