1. High school was where I actually made my first non-childhood friend. My family moved across the country when I was 10, causing me to lose contact with the kids I hung out with since I was 3. I did not make close, long-time friends until junior year of high school. I still hang out with them regularly to this day, at age 29.
2. Teachers who were actually knowledgeable, ranging from "somewhat" to "very". At least enough to explain things and argue correct answers from their knowledge or books they read, rather than smugly using the teacher's edition of the textbook.
That's about it. High school was the pits in every other way, and yes, a lot of bullying happened. It faded out by my senior year, becoming limited to an occasional snarky comment, and even then, they didn't "penalize" me for being snarky back. What made it even worse is not having a car, so I couldn't go on dates even when a girl showed interest in me once in a blue moon. (Going across the street to a Dairy Queen was out of the question; that's where all the popular kids went, and they'd sabotage me for sure if they saw me with a girl.) The one safe place to go on a date, ironically, was in a city bus, since popular kids wouldn't be caught dead in one. But given how looked down upon public transportation is in America, that wasn't an option.