For nightlife after the game, I'd recommend Mt. Adams, though there's not really any Reds themes there, unless ... you happen to run into Arroyo. Bronson's been known to hang out at a specific Mt. Adams bar on Saturday nights, and I've seen him there multiple times.
If you're looking to watch the Reds take BP, I'd honestly first recommend going to see them on the road. I've seen more Reds BP/fielding practice at three road games this season than I've seen in 25 home games this season. The gates open two hours before gametime, and the Reds will be out there taking BP when the gates open, but I'm not sure how much longer they stay out there. If you hit up the Reds on the road, you get the entire duration of BP/fielding practice before the game.