I was there when the Wilsons were running it and they organized the hunts themselves.  I looked at the website and it looks all gentrified.  As you said, they don't even mention hunting, except in the historical note.  What a shame.  I don't have personal experience with any of the other outfitters in that area.  The land that was hunted was public land, so you don't need a guide to hunt it, but it makes life a whole lot easier.  
As for gun choices, I hunted that particular hunt with a Ruger #3 in .45-70, and carried a single-action 44-40 for backup.  I felt I was well armed.  I did not have a dinosaur cleaver hanging from my belt and I used only the open sights on the rifle.  I got one crossing shot at a hog, about 15 yards away and shot behind it.  :oops:   They are some kind of fast.
Getting in shape can be a cheap exercise.  Try climbing steps a lot.  People don't really think about it, but coming down a steep slope can be harder than climbing up it.  Also take along some strong medicine for those aching bones at the end of the day.  Good luck.