Hi Ruud Welcome to the R.T.A. forums,

My choice would be your first one, heading N.E. to Zion and Bryce and then down through Page to the Grand canyon and back to Vegas via the Hoover dam and a chance to drive part of the original route '66 from Crookton to Kingman before the Dam.
You will be on the go a lot but it will allow you time to get an overview of each of these fantastic places.

Another option would be to do Day trips from Vegas.