Don't go to the Edgewater. The machines are old and dirty.
I like the Aquarius and the Tropicana. The Trop has a live band in the lounge every evening, which plays a pretty good mix of music, and there is a small dance floor.
There is nothing to see on the drive from Vegas to Laughlin. It's just endless desert, very boring. Terribles at Searchlight is a good place to stop for a "pit stop." Has a small casino and bar, and a store that sells groceries and souvenirs.