Jack McKenney's Canyon is a boat dive on Grand Cayman's East End where a sandy staging area drops into a canyon and then onto a deeper wall packed with reef life. The route is best for scuba divers who want a more structured east-end outing: clearer navigation, a deeper profile, and enough relief to make the chimneys and canyon turns feel like a real feature rather than background texture. When the weather settles, the site can feel especially rewarding because the wildlife, depth change, and wall shape all line up cleanly; when the sea picks up, the planning bar rises with it.