The only way I could relax was when I was with my children.
I know it's a rare privilege, but if one can really tackle something in adult life that means that much to you, then it's more rewarding than anything I can imagine.
I had this rare privilege of being able to pursue in my adult life, what had been my childhood dream.
I never use a computer.
But the best problem I ever found, I found in my local public library.
Always try the problem that matters most to you.