Kingsley has a couple of tough climbs. The walk up the first half of the 1st fairway, and between the 12th green to 13th tee. In particular, it's best not to walk directly from the south 9th tee to the green. The climb to the 9th green is a heartbreaker. Best to stay on the high ground and walk around.
I don't think it's fair to discredit courses that require a shuttle/cart to the golf course. A long distance between nine hole loops is perhaps more significant violation of the walkabilty. On the other hand, a course like Kinloch in Virginia regularly shuttles players and their caddies between nine hole loops (estimate 500-600 yards, a scenic journey along the lake), but otherwise a very high percentage of players walk.
Perhaps a better indication is the percentage of players who walk the course.
When I've posed this question to friends, Kapalua Plantation course has been mentioned more than once as a great course that is very difficult to walk.
At Stone Eagle, a bridge over the ravine on the 14th hole would eliminate 200-300 yards of walking. Similarly, a bridge over the 13th fairway would save a couple hundred yards of down and up. It's not worth the expense, though. So few people walk the course.