Our family is taking the plunge- renting an RV for a week, starting in Vegas and planning to see Zion, Bryce, and GC- probably in that order. We'll have seven nights total before needing to be back in Vegas to return the RV. Any suggestions as to how many days to spend at each destination? I've been vaguely thinking :

Nights 1-2 Cedar City KOA for Zion
Nights 3-4 Bryce Valley KOA
Nights 5-7 Grand Canyon (Which KOA? There are two listed for Williams)

And an early start back to Vegas that last morning (5 hr trip? ish?)

Comments and suggestions from Road Trip veterans would be welcome!

p.s. This trip is a precursor to decide if next summer we really want to spend THREE weeks in one of these things doing the Denver-Moab-Yellowstone drive.