In US it's a 3-day weekend, start of summer, and time for getting outside. It should be a good sign that so many people have lives. On the other hand, law enforcement like to take this weekend off as well. This creates effects of its own which remain a mystery to some of us like myself.
Still, for those lucky enough, it's a time of outdoor barbecues and picnics, fresh air and sunshine, and if you're really lucky, lots of happy playful lolis with popsicles and hot dogs in hand (or in some regions, bratwurst).