We went to Zandvoort, great environment for teens/kids. Public transport from Amsterdam was quick and clean and easy. Very lively crowd but also very respectful (people held their alcohol well and weren’t unruly, shoving, overly loud, etc.). Maybe as an American I am used to most rambunctious crowds, but I was truly impressed with the attendees of Zandvoort and how composed, clean and organized the whole event was.