Carlsbad Cavern is truly a wounder to see. We took the outside entrance and walked down into the Cavern. We received a coupon from one of the tourist information centers to receive a recorded tour at reduced rates. This gave us some background information.
The deeper you went into the cavern the more spectalur the formations became. You are allowed to use a flash inside the cavern now. I was using Kodak 800 Gold film and a 28-80 zoom lense. The lightning inside would allow a slower film but with the 800 speed I got good depth of field pictures.
The walk was cool but comfortable. It was an easy walk with steps and hand rails when needed. They say it takes 1-1/2 to 2 hours to do the trip. To enjoy it you need at least 3-4 hours. There is an elevator to take you down into the main cavern and to take you to the top if you choose to walk down. This is accessable to almost every age and should be enjoyed by all.
If you are more adventureious you can look into some of the other Caverns (Caves) in the park that are more technical. Check out the Park at www.ups.gov