I hope you both have a great trip and it is so sweet of you to do. The best themed rides in Knotts are the Calico Log Ride, Calico Mine Ride, and Iron Reef. The Indian Lodge has a show with some cool special effects. The rest is more for the roller coaster type crowd.
The two Calico attractions are must dos for sure, as those are the two I'm familiar with and have heard so much about of the years.
My friend is also interested in the 'Peanuts' themed area and live stage show, if those are still operating.
If we do end up going, I will definitely check out the Indian Lodge show.
We are both keen on live entertainment.
That is one of the highlights of the trip he is most looking forward to at Disneyland - experiencing the excellent roster of live performances in and around the Parks.
He is a 'coaster fan' while I am a bit more timid in that department, so he will likely enjoy their offerings.
I appreciate the suggestions!