Nice rides.
It's a pitty that you couldn't do Montagu pass, but there is also just so much you can fit into a day. From the photos you can see that the sun was getting low already and it is the wiser thing to not be caught on unfamiliar grounds in the dark with a passenger...
You've discovered what a lot of us have known for a little while - The Garden Route and 'surrounding' close by Klein Karoo area is a wealth of DS riding options. You'll have people like Trailrider who grew up there, has had his current bike for a year (and 10 000km -
all of them on gravel roads in his area) and still hasn't seen it all. He will also not become 'uitgekuier' for riding that area for years to come.
Someone who lives in George, have a DS bike with petrol in the tank saying he's bored is just plainly lying.
The good thing about it is that it is doable over a weekend (take halfday on a Friday, ride there before sunset, do a ride out the Saturday and come back the Sunday).
In this instance it is also worth while to consider getting a bike trailer - you don't want to race out there on the bike just to do a long ride the Saturday to race back again on Sunday. The relaxed car ride for two sets you up for a little more leisure while not having to worry about riding back in daylight. (But that's only if you can't make a long weekend out of it)
What you should also do now is search ride reports about people that's been in the area (theres lots - like TR's epic ride, me and my wife's two up to rhodes trip, Luckystriker, Butch etc - also check out TR's blog https://trailriderreports.blogspot.com/ ) and check out the pictures again - it is amazing how the pictures just all of a sudden look different when your mind has got the 'bigger picture' and fills in the area outside the border of the photo in your minds eye.
The more I ride, the more I dig out (and appreciate) older ride reports about the same areas.
I say it again - having a willing partner that is also enjoying sharing this passion/hobby is really cool.
Maybe you can get her to do a little write up from her perspective ?
Thanks for posting about this.