Ok
For 6 people maybe 2 Lincoln Town Cars. My favorite car too!
To see most of some '" old" sights maybe take this route. 5 days it is:
Day 1: Leave Las Vegas on 93. Make a stop at Hoover Dam (parking at the Arizona side is free, if you can find a spot). Then drive 93 to Kingman. Take I40 for 5 miles to exit 53 and continue on the "Mother Road" R 66. Make sure to stop at Hackberry for a cold or warm drink and explore the old R66 outside museum. Amazing. Then to Valentine (maybe take a picture for your Valentine Card )and on to Seligman. Another must stop on R66. You'll see why. Great hamburgers at Delgadillo's and the show of the owner is for free. Then hit I40 again. Drive through Williams and continue to Flagstaff for the night. A good 300 miles via R66 from Las Vegas to Flagstaff. Find a hotel on R66 close to the trains,gives you the best Western feeling at night -lol-
Day 2: Drive 89A from Flagstaff to Sedona. A great route. Stop at Oak Creek Canyon for the overviews and maybe a short visit to Slide Rock SP. You won't have time to explore Sedona thoroughly but take an hour or so to admire the red rocks. Then take az179 and pay a short visit to Chapel of the Holy Cross on your left hand side in Sedona. Continue to Montezula Castle for a short visit and drive I17 towards Phoenix. Maybe a stop at the Rock Springs cafe (exit 242) for a famous pie. Pass through Phoenix and head for Tucson for the night.This also will be a good 300 miles Flagstaff-Tucson with the detours.
Day 3: At least visit Sonora Desert Museum west of Tucson for a couple of hours. Best place to learn about the desert and you'll also see a lot of Saguaro Cacti. Hit the road again before noon and head for Tombstone for a visit. Back to I10 and drive to Willcox which has ample lodging. Short drive this day. Count on 175 miles.
Day 4: A long driving day. Start I10 east again into New Mexico. Pay a short visit to Steins Ghosttown just across the border on your left hand side before Lordsburg. Drive to Las Cruces, to El Paso and to Van Horn along I10. 16 hotels are waiting for you. Not much here.
You're on the road for app. 400 miles this day.
Day 5: This will be a long day to before you reach Sanderson.
Take us90 from Van Horn to Marfa. There's an old hotel (Hotel Paisano) with a lot of history and a fine County Courthouse. Then take us 67 to Presidio and tx170 along Rio Grande. This is a magnificent stretch of road. There's an old movie set just before Lajitas. Drive through Big Bend NP and north on us 385 to Marathon. Another classis hotel here (Gage Hotel). The last part of us90 to Sanderson is not bad at all. Count on app 375 miles between Van Horn and Sanderson. October is a great time of year to visit. No need to make reservations.(Unless you want to stay in Big Bend)
I did not mention about Grand Canyon NP. If you never have been there, it's top priorty but you were asking for a driving trip. Many more possibilities. This is just one of them and I'm sure others will provide more idea's.
Tet