1) It's the Bay Area so space is limited; however, there's this lovely, little grassy area behind one of our buildings. On any given day one can find a handful of students throwing frisbees, gathering around to share lunch conversations (or lament about a recent exam) or simply lying in the sun.
2) Another perk about living in the Bay is that Napa/Sonoma are SO close. We usually gather a small group of students and enjoy the "high life" up in the valley for a day. Living on a student's budget, we usually pack a picnic/potluck to enjoy a low-cost lunch together. The wine is wonderful but spending time with friends in the outdoors makes it even more amazing.
3) This may sound cliche but coordinating study groups is also a lot of fun! We gather around to share our knowledge and learn from one another... it makes learning fun!