Indigo Lounge is inside Bally's, past the poker tables and the entrance to Le Boulevard. I was here more for the overall ambiance and music than the drinks. The lounge itself isn't too big, but it does have a good amount of tables surrounding a handful of flat screens. There are regulars who supposedly "have their own seat," but you can sit anywhere. It's definitely a chill place to watch some games; however, I love when the live bands stop by! The ambiance is very laid back and relaxed, especially with the lights dimmed. I cannot remember their name, but there was a jazz band here the day I stopped by and I thought they were fantastic! It reminds me of the live music venue between BurgR and Planet Hollywood's casino floor but a little more "close-knit" since the latter is in an open area.
If you happen to be inside Bally's and just want to sit down and relax after strolling around, I say Indigo Lounge is a solid place. Go for the bands or when there's a game on.