Atlas is the biggest beach club in the world with the longest beach bar in Asia. It's also centrally located in Berawa, although you'll want to give yourself plenty of time to leave and arrive during peak hours.
A beach club for those who don't want to spend hours lying by the beach, it's got an eclectic line-up of food vendors (including a cereal café) as well as traditional kecak fire performances, magicians, and Balinese dancers. It's also usually where international DJs set up camp when playing in Bali.