Universal Healthcare. End homelessness. Eliminate poverty. Those three right there off the top of my head. Then I'd start thinking about getting everyone out of prison and wiping clean the slate of "crime". I'd have to figure out something to do with violent offenders, a way to actually rehabilitate them and get them back into society. The police would be abolished as well, what I'd replace them with is community defense of people that live and work in those areas who know each other and can actually intervene in a humane way to any crisis that may come up.