Kaua`i is perhaps the most mellow of the main Hawaiian Islands, especially after the sun sets below the horizon. Although it's mostly known for it's perfect sandy beaches and clear blue water, there's still a good array of bars and lounges that offer dancing and live music. Although wild dance clubs with bright laser lights and loud bass are absent from the island, there is a generous amount of places to dance and socialize to local bands and music.
For those looking for laid back fun, check out Kauai's answer to the local dive bar. In Hanalei locals and visitors mingle together enjoying conversation, drinks, and live music at the local staple Tahiti Nui and Hanalei Gourmet. Also in Hanalei is Bouchon's Hanalei, offering good food and nighttime live local music and dancing in a modern restaurant atmosphere.
Out on the east side overlooking Kalapaki Beach is Duke's Barefoot Bar, which provides tasty and strong cocktails and beers right on the crescent shaped beach and surf break. Nearby is the Nawiliwili Tavern, and Rob's Good Time Grill, both providing a venue for sports on the big screen, full bars, and live local music on the east side in Lihue.
Days spent on Kauai's beautiful beaches, hiking its trails, and swimming in waterfalls will come to a perfect end with after dark dancing and fun.