Climbing/bouldering at a bouldering gym, its sociable but since its often a solo sport you can leave any time.
Also every climber I've come across is very chill, and its good exercise.
Gaming
Gardening
Hiking
3d printing
Woodworking
Reading
Programming (python), making music/learning instruments and synths.
Music is a good one. Especially electronic instruments, mostly because you can play and record with headphones and it's easy to get a lot of different sounds to play with.
Even electric guitars sounds great with amp plugins nowadays, so headphones work for that too.
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