You are supreme ruler...

[Stranger in a strange land]

-institute an intelligence visa: any foreigner who earned a score of 2200 or better on the SAT or an equivalent score on the ACT, or who had earned a PhD in any topic or a postgraduate degree in any science or mathematics-related field would be eligible to receive a probationary residence visa provided he or she had no felony convictions, and would be eligible for a green card after two years
-institute a beauty visa: any foreigner deemed sufficiently physically attractive by a specially-appointed panel of officials would be eligible to receive a probationary residence visa provided he or she had no felony convictions, and would be eligible for a green card after two years
-immediately repeal don't ask don't tell
-simplify the tax code but keep the progressive income tax in some form
-make it illegal for states to put a sales tax on food and medicine
-start a massive crash program to build nuclear power reactors
-double funding for NASA and instruct it to solve the problem of transporting nuclear waste from said reactors to a storage facility beneath the surface of the Dark Side of the Moon.
-repeal the death penalty for most crimes, but retain it for treason, terrorism, and gross financial malfeasance
-break up AIG
-force Fannie Mae, Freddie Mac, Citigroup, GM, and Chrysler to re-open under new management
-take Andrew Jackson off the $20 bill
-federal Civil Unions
-set the size of a congressional district as the population of the least-populous state, rounded within some range
-legalize travel to and trade with Cuba