The way I did my undergrad, I ended up in a similar situation. Took a weight lifting class which actually was quite helpful and still use those principles today. Not that I'm a power lifter or anything like that, but just solid fundamentals that I take with me to the gym. I also took...wait for it...yacht racing. Yeah that's right. Needed another 3 credits to burn and decided to learn how to sail one of those little JYs. Lots of fun. Capsized a bunch of times. But a very enjoyable way to finish out my college career. None of this ever came up when I was interviewing for med school. Cheers.