You must take a tour to see Antelope Slot Canyon. Prebook with one of these tour guides. It's a very busy tourist attraction.
Tour OperatorsI wouldn't book with a third party.
Upper AC involves a couple mile bumpy Jeep ride, then you walk straight into the canyon at sandy floor level. Used to be out and back, but they've now built a series of ramps and steps to exit up and around the canyon back to the vehicle.
Lower AC involves a short walk, then you descend a long set of stairs down into the canyon. Exiting up through a crack to parking lot level. Lower involves just a bit more squeezing and scrambling through, but nothing a reasonably able person couldn't do. It's not really necessary to do both. You will be sufficiently awed by one.
As far as I know, the only RV parks with hookups are Wahweap by Lake Powell and Page Lake Powell Campground in the town of Page. By the lake is nice, being in town will get you closer to other sites. There is also boondocking on the sandy beach (for a fee) at Lone Rock Beach. Better be careful there.
You can do Horseshoe Bend Overlook on your own. It's free, but parking costs I think $10.
The float trip down the river is a big hit. There is only one company authorized to do this. See here:
RaftingIf the Visitors Center and tour at Glen Canyon Dam ever open again, those are interesting. I don't know the status right now.
I like the Dam Overlook off Scenic View Rd. Also Wahweap Overlook (especially at sunset) off Hwy 89 north of the dam.
You say you are going in fall, but then you ask for best time of year. Huh? Fall is good!
2002 Itasca Suncruiser 32V
2012 Suzuki Grand Vitara