If you want to go camping, Team Green is coming up to Mammoth Cave to camp to enjoy the above and below ground activities. This activity is being organized on Team Green's website so you must register with them.
From Team Greens website "Join Team Green Adventures for a relaxing yet adventurous weekend at Mammoth Cave National Park, one of the nation's finest outdoor recreation areas. We'll spend the weekend touring the cave system, camping in the state park, hiking and biking on the park's trails, and will even have the option of canoeing the park's river if the weather is warm enough. Come enjoy the spring weather with us, and bring the whole family!
When: March 22nd-23rd, 2014 at 8:00am (carpool)
Where: Mammoth Cave National Park
1 Mammoth Cave Parkway
Mammoth Cave, KY 42259
Cost: FREE for Members, $5 for Non-Members. See trip itinerary below for additional cost information on in-park activities."
Go to their website for more details and info on registration.