Do students have free time?

It's pretty common knowledge that ETH students don't get vacation. I've also heard of ppl who study constantly. I'm not sure if I can sustain this level of grind for 3 years. So my question is specifically for Math students, since I'll be studying math starting September (Feel free to chime in if yr from a diff Major): Do you guys have free time at all. How do yall schedule it with all the courses yall r working on? Do you guys go for trips and stuff during the year?