Didn't this come up recently? Groundhog day?
Labs are usually going to be a popular pick for this poll. They have a great disposition, and are hard workers. They love the outdoors, people, and usually other dogs. Mine was a tremendous hiker. I'd walk downstairs with my 'hiking hat', and she'd go nuts. Could not wait to get on the trail.
Coonhounds can be good dogs as well. The picture to the left is a Redbone. However, I will say that she is not as enthusiastic of a hiker as my lab was.
For example: My lab would run all up and down the trail on the way UP the peak, and on the way down would stay with me. She would go from the first in the group and back to the last to make sure we are all doing OK. The Redbone, however, stays with me the whole way up, and on the way DOWN she runs ahead and can't wait to get to the car. I don't take her as often as the Lab.