I was there from November 2-7 in 2006, and had a great time too. It was in the low 30's that year at night, and the restrooms had been shut down in case the water froze in the pipes, so I had to shower in the RV. The campground water was on at the dump station.
Driving around was nice, you can drive into the canyon that time of year, but must use the shuttle bus in other months.
Be sure to check weather.com and check the monthly average temps that time of year that you plan on visiting. It is very pretty any time of year. Much cooler than Las Vegas in April, and the drive up interstate 15 from Nevada into Utah was a lot of fun to look at.
Fred.