(4 of 5 sweat drops)
Difficult - A good level of physical fitness is required. The ability to swim and be comfortable with small spaces is necessary.
Mature 10 yrs old and up
Comfortable light weight long pants/shorts and shirt that allow for easy movement and can get wet (swim gear can be worn in the cave, but it can get cold). Well treaded sneakers, hiking boots or high quality river shoes with covered toes, socks, mosquito repellent, a full change of clothes.