I'll have to respectfully disagree with the idea that "anything worth doing is nontrivial." This might certainly be the case for you, but I would love to just spend some time learning Haskell, writing an OS for fun, reading papers on Theoretical Computer Science, or trying to find security exploits.
I don't think these things are hard, at least they certainly aren't things I would doubt myself to be able to do. These are just things I'm sure I could do today if only I had more time, and at least to me these are definitely worth thing for one reason: they make me happy