explain belmar to me like I’m 5

semi-recent California to Bucks County PA mom who lives the beach and my kid loves the beach. The area we used to go to based on a friends recommendation, a teeny tiny spot south of Cape May, is super nice and super chill. But it’s 2.5 hrs from me. A different friend told us we should check out Belmar. Well we went today Tuesday 5/19 and I have QUESTIONS. I am 36 and I felt like a dinosaur. Seriously every one there did not even seem old enough to drink. High schools are still in, did every kid in NJ skip today and go to Bel Mar? It was super super super crowded, the area around Playa Bowls where we were was insane, lines of 100 teens waiting out the door just to get into 7/11, and it took me 20 mins of circling to find a parking spot and I got blessedly lucky. I understand beach tags go into effect after this weekends holiday, after that happens is it less crowded? Is it a noticeable night and day difference? PS not complaining. My kid LOVED it and while we were feet away from everyone else around us everyone was super chill and the water was very clear.🐚🧜‍♀️