My mind is always at least a little occupied with finding ways to optimize things. The area it always converges to is of course happiness, and more specifically, a collective happiness. To this end, there are a couple vehicles I'd like to present:
I wield here a synonym of the idea of art only consisting of things without function. I would really like to add biking infrastructure i.e. LUUP/what Citibike should be, but those can very profitably be optimized and thus need less consideration.
At some point I will think about how to (efficiently) implement each of these. I'd want to establish at least one of each in my lifetime.