The ranch we hunted on was the "Little Creek Ranch" in Collbran, CO.

http://www.coloradowildelk.com/

It is a high fenced 1000 acre ranch. The hogs were spread over a 300 or so acre thicket crossed with small creeks. Our guide, Pete (who I highly recommend and would ask for) said without dogs you can walk the thickets all day and not see a hog. They let the dogs loose and when they start baying you start walking in the thicket. It took us about 30 minutes to walk through the thick stuff and get close enough to the dogs that you can hear the hog (he's within 10 yards at that point but you can't see him), when the big one broke out next to us he was 12 feet away and none too pleased. Mine I didn't see until he was 8 feet away, but he wasn't coming just yet. The hunt cost $750 including two nights stay at very rustic cabins and home cooked food. There's a $200 deposit and if you don't get a hog you don't pay the balance unless you wound one. Gun safety's an absolute must since you're in the thick stuff and you don't want to be shooting your guide or his dogs and you don't want to wound the animal. Practice shooting offhand up close and personal. If I went again, I'd have open sights, but my 1.5-5x Leupold was just fine.

Hope that helps