@Freyrs_storiesI occasionally go to Starbucks, more for their internet than their coffee. (Good teas, and iced teas.) Teens come in after school and chat at a volume that's easy for me to hear (I'm 50% deaf).
They provide a good example of current teen speech and idoms, slang, etc.
Sometimes four to six members of a women's roller derby team come in. I have chatted with them on occasion. They are mostly just past college age, but I feel more comfortable chatting with them than the high-school age girls. 2 of them are veterans.
Before the Covid-19 one of the batistas would read chapters of a paranormal mystery set in Paris for me. So too a high school girl who wanted to become an English Major.
I usually bring a couple of binders of notes, or sometimes a chapter or two of what I am writing. Both young women had asked me about what I was writing. Sadly, I have not seen either for two years.
Even if you just sit and listen.
Food courts at a Mall are another possibility.
I recently went to see a movie in a theater, both before and after the movie the teen girls were talking loudly, so that is a possibility too.