My son is with friends right now at Hilton Head. They are in a two bedroom unit in building 15. When they arrived Friday night, there was a really bad smell in some parts of the unit. It was late, so they called Sat. morning. A housekeeper came up to check, said it was probably the marsh (?), so she sprayed some air freshner. By the end of the day, it was back, and this morning she came again, without being called, to spray again. He said it was mostly by the entry and in the living room the first night, but now you smell it all over the unit. The housekeeper said no one else was having the problem, so I would think it's NOT the marsh. I told him to definitely report it when they leave on Tuesday, as it might be a dead animal of some sort between walls or in a vent or something. They are on the second floor of a three floor building. What do you guys think? Otherwise, he said it has been wonderful there - perfect weather, and the ocean is still fairly warm and hardly any traffic on the island - unlike the summer.