beach bum = a person who spends a lot of time on the beach sunbathing

catch some rays = spend time outdoors especially when it is sunny

cool as a cucumber = level-headed, collected, calm

dog days of summer = the hottest and most humid days in the summer

fire up the grill = get the cooking started

rain or shine = regardless of the circumstances, by all means

summer fling = short summer romance

sunny disposition = positive attitude, cheerfulness

sun-kissed = beautifully tanned

vacation mode = a relaxed and carefree state of mind