I'm a huge fan of the Gateway Clipper Fleet. I've been on most of the ships, which range from some pretty small vessels to the rightfully named Majestic. The most popular tours are the dinner dance cruises, where you'll sail up and down the rivers while enjoying a buffet and live music. I recommend the Latin American themed nights, when they usually have some pretty awesome salsa band perform. I'd give it 5 stars, but it's not cheap for a night out, and alcohol/blended beverages are very expensive. Overall, though, a really fun night out on the rivers!