My husband and I spent a long weekend at Ulu Muda being educated and entertained by Hymeir, the owner and a well-known Malaysian conservationist and cave expert, and J, the British guide in-training and a conservationist in his own right (when he's not a police officer in London). We hiked (bring leech socks if you have them and borrow from Earth Lodge if you don't!), looked for wildlife, explored small undeveloped caves, bathed in natural hot springs, and went tubing down the cool river -- a welcome relief from the rainforest heat and humidity! Everything is totally customizable to your preferences, including the activities you take part in and how strenuous they are. The accommodations were basic but met our needs, especially considering the remoteness of the location, and the food was abundant and somewhat varied with lots of tea, coffee, and snacks to keep you going through the day. Hymeir and J were a fantastic duo: passionate and knowledgable about their work and great company. Overall a wonderful experience, especially falling asleep to the roars of elephants reverberating through the jungle!