Hi Sgt Bilko. I am doing something similar in late April, leaving Vegas on a Thursday afternoon and then riding on a loop to get back to McCarron for about 2pm on Sunday. I am thinking of doing your suggested route but am not quite clear on directions yet. Do you mean over the Hoover Dam and then around the south side of Lake Mead or rather, nipping down to see the Hoover Dam then looping back North to pick up the Northshore Road? From there I can see the route through to Springdale and Zion then up to Capitol Reef.
Mexican Hat and Monument are easy to route too as well and then it looks like a Sunday schlep back to Vegas via Flagstaff.
Any further guidance would be fantastic.