New bike computer
Bike computers exist to tell you how fast and far you have ridden, what your cadence is, how much power you've produced and how many calories you've burned. I think they'll even tell when you are at sea level. What they don't tell you is how much fun you're having. I'm thinking that would change everything.
So if you were developing an algorithm for how much fun you are having, what additional inputs would you measure. How many people you pass vs. how many pass you? How many people return your wave or greeting? Downhill vs. uphill (either distance or time)? Maybe some kind of sadistic or masochistic factors (I don't judge)? What makes you happy when you ride? What would you measure?
FWIW, I'm also working on developing a time machine but there's no hurry on that one.
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.