Booked a Sunset Dinner Cruise online in advanced for two.
We arrived and the greeter at the front informed us which boat we were on (Empress). Make sure you ask, you don't want to board the wrong boat.
Theirs a photographer that stops everyone as you're boarding to take your photo which slows the line so we kind of just formed a u-shaped line to wait.
As soon as you board you can hit the buffet and bars. The food was actually pretty good, I really liked the garlic mashed potatoes.
I've never seen Pittsburgh from the water and it's amazing! Bring a jacket on this cruise, you'll thank me later. We really enjoyed ourselves. Definitely will be taking another cruise soon!