talk
It will really help you to know some Malay. Some people speak English, but do not expect everyone to be able to. The local Terengganu accent is quite thick, but most people also speak "standard" Malay.
respect
Terengganu, with its nickname as Darul Iman Abode of Faith in Allah, is known as a conservative, Islamic state. You will have a better experience if you respect local mores when you are outside of resort areas where people are used to foreigners dressed in bikinis. It is not necessary or expected for non-Muslim women to wear a headscarf though it would certainly meet with approval, but both men and women should wear clothing that covers all or at least most of their legs no short shorts, and women should wear blouses or dresses which cover their torso. Long sleeves are preferable for women, and outfits which show the shoulders or midriff should be avoided. The watchword is modesty. Tourists dressed in shorts and skimpy tops are really out of place in this state.