I could conduct the interview by either telephone or e-mail. My favorite is the Wild Cave Tour at Mammoth Cave National Park. It involves just what the name suggests. It stops short of any rappelling or belaying but is a worthwhile trip nonetheless.
Groups are limited to fourteen for safety reasons.
The group has to work as a team to negotiate several obstacles along the way. While this trip is open to anyone it is NOT for everyone. It's strenuous,damp and dirty. Physical fitness is required. On my many times on this trip, it seems that fully half of the tour group is comprised of Boomers.