I grew up in Henderson, and when I was a kid all that Henderson had was 2 casino's on Water Street. Which is the main drag through downtown. One of which is the Eldorado, and it has this really cool orangish red neon sign that towers above it's entrance.
It's currently owned by the Boyd group and it's certainly gone through it's changes, but, it's old school Henderson and worth a visit.
What's it's charm and appeal? Mostly it's older than dirt. Oh and it's just a casino, no hotel is attached to it. How odd these days. But it's so full of local Henderson flavor you'll be glad you came to play some nickel slots.
So, my suggestion. Leave Vegas for an evening...cruise Water street and rediscover main street in a town that time didn't forget but remembers it's background.