Just got back from Perhentian. Saw idiots standing on the corals and one was waving at his friends saying "Eh come here! Can stand on the corals!"

Another malay guy wanted to go and catch the penyu but his friend told him "nanti orang putih marah"

It's not that big. Just enough to rock the boat a bit every now and then. Are you going snorkeling/diving? They will also look at the weather and sea conditions. If it's not safe, I think they won't take you out.