If you're the sort of person who doesn't come alive until after dark, you might be a little lonely on the Big Island. Blame it on the sleepy plantation heritage. People did their cane raising in the morning, thus very limited late-night fun.
Still, there are a few lively bars on the island, a handful of great local playhouses, half a dozen or so movie houses (including those that play foreign and independent films), and plenty of musical entertainment to keep you happy.
Also, many resorts have bars and late-night activities and events, and keep pools and gyms open late so there's something to do after dinner.
And let's not forget the luau. These fantastic dance and musical performances are combined with some of the best local food on the island and are plenty of fun for the whole family.