As of early April 2012, Peter Fish, of Keene, had hiked 5,344-foot Mount Marcy 763 times. The 76-year-old retired forest ranger, who’s still a High Peaks fixture after working there from 1975 to 1998, chats about how to appreciate this place; why he sports a kilt; and where he’s planned his terrestrial exit strategy—not on what he calls “the Big M.”