On my trip to Glacier, I went with three other people: my 58 year old mother, her 72 year old partner and my 37 year old wife. I had grown up riding horses and had even owned a horse when I was a boy. None of my party, however, had ever been on a horse before but all were willing to try a 2 hour horseback ride in the park. We signed up with Glacier Park's contracted riding outfit named Mule Shoe Outfitters.
Mule Shoe ran a pretty tight ship. They matched the horse's demeanor to the rider's ability and size, they gave good basic instruction and they placed a guide at the front and the back of the group. The horses were well mannered for the most part and we went through some beautiful trails that led over 2 bridges and into a nice old growth forest ant the base of a ravine.
I had two complaints about the program. First it was too easy. Even the complete novices in my group wanted and desired more action from the ride. The horses were never allowed to trot and were in a strict head to toe single file line the whole way. The other problem was that the trail they used was so muddy from recent rain and heavy use that most of the trail was a big slop fest where I was concerned about the horses footing.
This is a good trip if you have a complete novice who wants to experience what it is like to ride a horse, but if you have ridden before pass on this experience and spend your money on whitewater rafting or some other fun activity.