AvantStay is a national company that operates large vacation homes in several markets, including Hilton Head Island. Its Hilton Head listings are private homes aimed at groups, with private pools, game rooms and decks. It has no office on the island: you book through its website, and it says a local team handles inspections and guest support around the clock. AvantStay states a no-parties policy across the homes it manages, so it suits family reunions and group trips more than event rentals.