Love you
I like this idea, no boundaries at all.
Solving Rubik's Cubes, very fun hobby and satisfying to improve at.
Playing board games solo. Of course playing with others is great too, but you've probably already done that. Some games are designed to play solo and they're really fun. Kinda like a tactile video game.
Video editing is so cool when you get a clip to look exactly how you want it.
Sleep No More might be ending soon (it keeps getting extended), one of the coolest things I've ever done. It's like an immersive theater experience where you walk around a huge building and you can explore basically anywhere. Sometimes actors will do something you can watch, or you can ignore them and go to the next room and explore. Everyone wears an identical mask except the actors. It feels almost ghostly walking around.
Probably the best websites I ever read that had the greatest impact on my worldview:
The Life You Can Save by Peter Singer
https://www.thelifeyoucansave.org/
80,000 Hours
Essays on Reducing Suffering by Brian Tomasik
The book "Diaspora" by Greg Egan, which is a clear-headed exploration of the forms people will take as technology advances. It's a beautiful and sad book, particularly because in some way it represents the best case scenario for the future of humanity, where in the setting of advanced civilization people are mostly non aggressive towards each other, and shows that even in this setting the future will not ever really be a utopia.