President of where? POTUS?
Yep.
I'd immediately stamp on corruption everywhere (corporations would then start having -GASP!- to pay tax), stamp on military over-spend, ramp up spending on health and education, immediately begin a program of green power production on a net-effect basis.
I'd immediately withdraw from Afghanistan: Obama Bin Laden is dead and hanging around in the country will only cause more problems. Besides, once I'm in charge of the united states then I care a lot more about the 'states and a lot less about Afghanistan, so let the Afghans sort their own problems, rather than forcing our solutions on them which will probably result in them throwing the baby out with the bathwater sooner or later.
I'd also ban any products which feature built in obsollescance and massively stamp on imports from china. I'd attempt to patch up relations with Russia, but it takes two to tango.
I'd also pass a law that no person may be paid more than ten-twenty times the national minimum wage unless they own their own company.