Reading books which question my existing beliefs has become my favorite thing to do.
Enjoyed "Beginning of Infinity" & "Skin in the game" from those arenas
For me, it would be groceries delivery! Indeed, you don't have to be in lockdown to do it, but ordering groceries when I was self-isolated without any other choice to shop had its own charm as I was checking by the window if a delivery man is coming that makes you feel like a child that waits for parents to come back from shop :D Especially when you order food for a week, you usually won't carry it all to the fourth floor in an apartment building without an elevator.
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