Visited the Mulu National Park and spent a few days exploring and visiting Lang Cave, Deer Cave, Clearwater Cave and Lagang Cave (Fastlane), Long Langsat & Iman, did the Night Walk and Canopy Walk.
Witnessed the bats exodus as well (we were fortunate as it was raining in the evenings on most of the days that we were there).
We had very good and friendly guides i.e. Kenneth, Nimrod, Nik (sorry, not very sure if I've spelt it right) and Sukie.
A must go as it is also a UNESCO World Heritage Site and properly managed and controlled to maintain the pristine rainforest while respecting the flora and fauna.