I am a current Biophysics graduate student at Johns Hopkins University. If you want information, send me a PM with questions and I will gladly answer them in some detail.
You should know that as a physics major going into Biophysics at some specific schools you will be at a tremendous disadvantage if you have not taken any biology courses in undergraduate.
Before you send me questions, I'll just make a statement: Some schools focus on the biological aspects (Harvard for sure), and some schools will focus on the physics. Deeply investigate the situation...trust me