The Bowling Green League of Bicyclists is an active organization of local cyclists who engage in road and mountain bike riding as well as local bicycle advocacy and education.

From rapelling,zip lines,cave tubing to nature walks experience the culture of Mayans.Caribbean adventures best.

The Sequoia Natural History Association (SNHA) is a non-profit, membership organization that supports Sequoia and Kings Canyon National Parks and other areas of the National Park System.

Lost River Cave of Bowling Green offers Kentucky's only underground boat tour. Visit the enchanting Butterfly Habitat, enjoy sluice mining, bird watching, hiking, biking and many other activities at this outdoor haven.

Longhorn Cavern State Park, A Texas Hill Country Wonder, cave tours, wild cave tours, eco tourism, hiking trail, wedding and private party facilities. Educational, fun and family friendly activities.

Discover Waitomo - sightseeing attractions include New Zealand's world famous Waitomo Glowworm Caves & Black Water Rafting

The official website of Sierra Nevada Recreation Corporation including the official pages for: Black Chasm Cavern, National Natural Landmark; California Cavern, State Historic Landmark; Gold Cliff Mine, a historic 1880s mine in Angels Camp; Moaning Cavern, California's largest show cave chamber; Sutter Gold Mine, a real hard rock mine taking visitors directly into the famous Mother Lode and the California Zip Lines at Moaning Cavern Adventure Park. This site contains information on all of the guided walk tours and extended, wild expeditions, rappels, above ground activities and amenities, maps, directions, operating hours and costs for each location. Also included are free online and downloadable lesson plans on: people and caves, cavern geology, and cavern life, free fun and educational kids pages and news and media pages.