1. Tourists shall not travel around the national parks without guidance of local rangers.
2. Malaysia is largely conservative, Muslim country, and you should dress modestly, particularly in rural areas,to avoid causing offence. 
3. Sarawak in general is a very safe destination with relatively low crime rates. Tourists should exercise the usual precautions – not walking alone at night, not leaving valuables such as cameras and smart phones on display, using registered taxis, etc. 
4. Homosexuality is not widely accepted and homosexual acts are illegal in Malaysia, so same-sex couples are advised to act discretely in public.