Nomad Lounge is my personal favorite. It's especially great during the warmer times of year where you can duck in and get a bit of air-conditioning, drinks, and munchies. I love the bartenders there and we have always had excellent service.
I recently tried eating a meal at the bar at California Grill since I was solo and couldn't get a last minute ADR. It was also great with excellent service. I did make sure to get there around 5, though. I left around 6:45 and another couple couldn't get seats because the Lounge was all full.