Nightlife is huge in the US. Go to any big city and you'll see that nightlife sometimes lasts until the sun comes up. The same is true if you go to the beach. You can invariably find a bonfire party going on until the wee hours. Go to a ski club and ski all day and party all night. For me, Austin, Atlanta, San Francisco, Los Angeles, Tuscon, Nashville, Memphis, and New York are the places to party in the US.