I would promote public transportation by implementing more bus routes, trains, subways and especially public use bicycles. These modes of transportation can be easily accessed through a common access card.
I would try figuring out better ways to create reuseable and maintainable  energy sources more accessible to more people
Ooooh tell me more! How would you go about doing this!?
Ok! Since one day is really short for creating a lot of change, I would try creating more efficiency with the programs of health care, transportation, economy growth, etc. I would also try to reduce waste of resources and costs with what it takes to run a country. Digital security and guidelines with regards to DNA information uses and policies would also be a part of the list of things I'd try implementing! Do you think implementing a public scooter system would be beneficial or not to cutting down on cost of transportation and health if initiated in a metropolitan area?