2.5 days hiking/backpacking suggestion around Vegas

Hi, I will take a friend to southwest for a short trip, car camping/backpacker/hike. Ticket has been purchased, fly in vegas 12/8 Saturday noon, fly out 12/10 Monday 11:30pm at night.

I've been to these places around that areas (using LAS or PHX as base)
1. death valley 3 times(driving tour of most part of park, including titus canyon, never been to racetrak yet. July and Dec)
2. valley of fire once (Mouse's Tank and Petroglyph Canyon, didn't see Firewave, Dec)
3. zion twice (Narrows, landings angels, Observation Point, Sept, Dec)
4. byce canyon once(Navajo Trail, sept)
5. grand canyon twice (R2R via south kaibab and north kaibab, toroweap, Sept, Dec)
6. sedona three times (driving tour, no hiking, July, Dec).
7. Wave at Coyote Buttes once (Dec).
8. Navajo NM once (Betatakin)

we prefer car camping/hike, but also open to backpacking.

the places I am considering are as follows (most interested one on the top). I will check the weather 1 days prior to the trip then decide where to go.

1. Coyote gulch (hike in along Hurricane Wash, camping @Hurricane Wash-Coyote Gulch Confluence, hike to Coyote
Natural Bridge then return). this one is tough, the driving hour is about 7-8 hours.
2. racetrak, death valley (if go here, it most likely to be a photographing trip)
3. Havasupai
4. Toroweap (hike Lava Falls Route)
5. valley of fire
6. Grand canyon (down from south kaibab, night at phantom ranch if room vacant, up from Bright angel)
7. Keet Seel @ Navajo NM (but they have already close for the winter, reopen next May)

What do you think of these places in early Dec? Any other place you can recommend around vegas? I can revisit the place I've been to.

thanks,
Hiac