While much of the island is a so-called "marine reserve", not much is being done about the rampant growth on the island and destruction of the reefs. Also, litter (usually in the form of cans and plastic bags) is strewn all over certain areas of popular beaches (usually near the shanty towns). Much of the litter is not from tourists, but from the locals. However, since Phi Phi Don is popular for diving and snorkeling, the locals have done away with dynamite fishing and other harmful activities that had probably threatened the reef even more than tourism.