General pardon for any crimes he's convicted of 

Pressure Ukraine to give land to Russia for peace

Significantly reduce immigration from Mexico 

Prosecute people for what he calls election fraud 

Accidentally reveal classified Intel to the public 

Fire Jack Smith and/or otherwise end the Jack Smith prosecutions via the DOJ

Completely withdraw United States Forces Korea

Declare Jesus Christ to be the king of the USA

Keep up or increase America's current level of support for Ukraine (even if he seeks compensation from third parties)

If Donald Trump wins in November, what will he do as president?