I just completed my first year of vet school and I've spent this summer working at a research facility approximately 30 hours a week. However with that being said, when I'm not working I am at the beach, biking, running, etc. 😀
Most of my classmates went to work at traditional practices, obtained jobs with the USDA, etc. I also know a few who did some traveling and are for the most part just "taking it easy". I think it's nice to have an equilibrium between work and play during the summer.