Trader Sam's is a ton of fun if you like the whole Tiki vibe. I think the drinks are expensive but they are also potent.
There is interaction with the servers and with other patrons to some extent. I agree with
@Farro about the Tambu lounge, pretty slammed with people waiting to get into 'Ohana. It might be worth it though, the Lapu Lapu is a treat
The lounge at AKL is nice--the Dawa (?) I believe. The Outer Rim at CR is fun, it's one of the original lounges on property. Don't forget the pool bars at the resorts! Even if you're not swimming it's fun to chill by the pool. It might be my imagination, but the bartenders appreciate some friendly banter (when it's not too busy) and a gratuity. They might accidentally pour a little extra.