Do a spelunking tour
If you’re feeling adventurous, a caving tour is the ultimate thrill. There are quite a few options around, each challenging its visitors to abseil to the depths of various caves and crawl into their underground passages. If you like zip lining, the Lost World and St Benedict Caverns tours will be right up your alley; if you don’t mind getting wet and muddy, the Black Abyss tour combines spelunking and abseiling with an epic black-water rafting expedition.