What needs protection? 5 types of forest: lowland evergreen, semi-deciduous forest, forest over limestone, beach forest and mangrove forest.
Be an environment-friendly tourist. The adage, 'Take nothing but pictures, leave nothing but footprints, kill nothing but time' may be over-used, but the soundness of the advice certainly hasn't diminished.
During your visit, try to do the least damage to the environment.