A little creativity goes a long way.
Teens are notoriously difficult to please, but stereotypes of them living robotic, passionless lives while glued to their phone screens are often exaggerated. In reality, teenagers feel deeply about their passions and interests, and they just need a little nudging to take those interests offline and into the real world. That can even include friendships; since teens live so much of their lives online, that's where their social lives have migrated, too, and they might be at a loss for fun things to do when they meet up IRL.
These teen activities get them to indulge in their passions, stave off boredom, and have a good time. Some are better for groups of friends, for the next time you have a gaggle of teens in your basement who seem at a loss for what to do with themselves. Others are better as family activities, where you can involve yourselves and even little siblings. All of them are meant to be fun, but some also sneak in learning components that will look good on a future resumé or serve them well when they finally leave the nest. Either way, you'll never hear them complaining about boredom again.