Related EE Hobbies/Projects?

I'm a senior in Electrical Engineering and want to better understand all the concepts and put them into practice. I thought finding a hobby or project would help kick-start this process however, I'm kinda at a loss of what to start.

One of my professors suggested Ham radio, which seems interesting enough. I personally have always wanted to repair old technology but, I'm worried that won't really teach me much.

Any ideas or additional info?