"For me, the first course that always come to mind in this discussion is Pete Dye GC in West Virginia. While I have witnessed walkers there, I would not be interested in walking this course myself. Among my list of favorite courses, it is only one I can think of that I truly love playing but consider unwalkable. Beyond that, I can't think of another one. I am playing Kapalua Plantation at the end of the month, so perhaps there will soon be two on my list."
To quote the film Dodgeball, "if you can walk Pikewood National, you can walk Pete Dye."
I don't understand this one - I walked Pete Dye GC in the middle of a really hot summer day on my visit there, and it wasn't arduous. The surrounding setting is a little mountainous, but the course itself isn't especially hilly. There's a bit of a climb up to 7 tee I guess? The transitions are very compact throughout.
Pete Dye GC remains in my personal top 20. Of those, I'd compare the walk to Old MacDonald or Lancaster CC - hilly and rugged, but compact. White Bear Yacht Club might be a tougher walk than all of them thanks to its hilliness, but certainly not unwalkable.
Dismal White is the course I personally rate the highest that I would not expect to be an enjoyable walk. I've walked Landmand twice, but I'd generally consider it a cartball course - it's probably the toughest walk in my personal top 50.
Cabo Del Sol Ocean (back before they ditched the old 17 and 18) was the course that felt most held back by its lack of walkability to me. It's an undoubtedly awesome collection of holes, but it just felt like less than the sum of its parts - it lacked a certain flow for me... possibly also hampered by the very slow round.