One thing that's important if you want to do that is to take humanities courses seriously. Take courses on literature, art, philosophy, history, social science. Go into bookstores and read random things. Get involved in student government, eat well, and exercise regularly. Write poetry. Fall in love. Fall out of love.
The reason for this is that if you want to use your astrophysics degree to do something other than astrophysics, you have to "dig your own path" and reading about French history helps you do that.
The other thing is that people that are interested in astrophysics are usually interested in understand the universe and Shakespeare is part of the universe.