Summer...
I teach at a University so during the summer (once summer session finishes up), my time is much freer and I have far fewer responsibilities!
Vacation! Because both DH and I are tied to an academic schedule, we can't vacation whenever we want. Summer is when we spend most of our vacation time, with a week or two at a cottage by the ocean, visiting my sister/BIL in NOLA for a week, spending time visiting other relatives. Although we travel during the year, it sure is nice to be able to take longer vacations!
Grilling. Most nights, supper in the summer is protein on the grill and a salad. Not too much fuss, not too much mess, easy clean up, and tasty food!