Anything physical, strenuous and fairly complex. Lifting weights heavy enough that you really can’t slip on technique, climbing without a rope, wrestling, dancing with a partner or to a choreography, cycling in terrain or traffic, hiking on a steep cliff side.

If it keeps me in the moment and 100% connected to my body and/or my surroundings, I consider it meditative. It keeps my mind from wandering to the past or future, or any worries aside from my most immediate next physical movement.

Like grapefruit. Bitter and sour.

I second things like spare tire, pillows, less focus on electronics (boredom is a gift not many are given today), take time for spontaneous detours and breaks, drink water and limit intake of sugar and quick energy.

Try to involve the whole family in the planning.

Maybe there’s something the kid wants to take a look at, or that might be helpful for a school project/class or to talk about in show+tell (ancient burial site, gigant cheese, takeoff/landing strip for hobby airplanes, arcade, space museum).

Make sure to move around and stretch at breaks and in the car, perhaps everyone can take turn to lead a “movement minute” where one person does a series of movements or stretches and everyone else follows (make this fun and silly, stretching doesn’t have to be boring! do things with name like frog-jumps and helicopter arms and/or make the instructions silly like “keep your hands on the ground and make your butt touch the ground then make your butt touch the sky”). If everyone get to take their turn to lead they might have fun with it instead of complain. If your kid is prone to embarrassment, find a bit of shelter to do the stretches in, behind a bush or other structure not visible right off the road.

Have a 5-15 min dj session every hour where one person get to play a prepared playlist, and another person gets their turn the next hour (or take it in a row if your family also has trouble waiting for their turn). If you really want to structure it you can suggest different themes for the playlist, like “songs that represents the roadtrip”, “songs you wish grandpa/great-grandpa could have heard”, “songs that make you feel something”, “songs from when you were little”, “songs your friends like”.

A short RPG could be fun for the family as the driver can also be involved, there are systems that only require a set of six-sided dice, and DM-less games where everyone plays (I think “bunny we bought a house” could be suitable for a 13-year old, and they could get to control the pen and paper to draw the dungeon as you play it).

Go to bed early and give eachother some space once you leave the car for the night. Don’t demand a lot of socialising (unless everyone want to) at dinner or afterwards. Let everyone decompress on their own. …unless of course everyone has had their headphones in and been on their devices with their friends all drive - then its probably time for some family time.

Skins UK attempted to deal with every topic they could get their hands on, including lesbianism (and homophobia iirc), with the drama turned up to 11.

I don’t know how it holds up today, but back then as a dramatic teen myself I loved it.

I’m not sure I understand the question (devoid of good morals, full of bad morals / anti-moral, or not touching on morals at all of that’s even possible?)…

but Drawn Together might be the answer.