i812, you might find that the President doesn't have the power to do what you propose. It requires Congressional action to redefine taxable income or reclassify capital gains and dividends.
Philhelm's suggestion of ordering troops home is slightly more realistic, although they certainly wouldn't make it home in a day and the next day the old commander in chief would just order them right back to where they currently are.
The bottom line is that if you were President for a day, you wouldn't be able to do squat since you would be President for more than a day. Pardoning folks would work, but you'd have to know their names in advance. I don't think that you can pardon them by category.
Originally Posted by TexTushHog
You're most definitely correct, but these are theoetical actions that a president may take. Even with separation of powers, there is plenty of power that a president can wield.
I also think my third one could be done, since isn't the President the head of the Dep't of Justice? He could just to end the War on Drugs by de facto, through simply not enforcing it at the federal level, if my understanding is correct.