I don't have any specifics, but I have some ideas for your search.
Check out the various health spas. Most of them have varying degrees of hiking available. Some are almost all hiking while some are more gym-exercise. Spend some time searching the internet and you should find something. Most of them also offer a weight-loss program. And pampering yourself with a massage after a strenous hike is nice also!
Sorry I don't remember any specific names but here's what I remember from a search I did last year. There is a spa in British Colombia that is only hiking. There is a spa somewhere on the east coast what has hiking and an equestrian center. Most of the spas in the desert areas will have hiking available. Almost all the spas have some form of hiking available, but be careful to see if their offerings fit your fitness level. If you have done a lot of hiking / backpacking, their idea of a hike may not match yours.
Good Luck.
And if you find some place good, let us know.
