On a recent visit to Silverton, we walked around the giant tree aquarium to see a few stingrays and giant neon fish. The aquarium has a semi-circle of seating around it so it's a nice place to relax. Keeping to the theme, there is a small group of mermaid paintings that make up the Mermaid Cove Art Gallery.
Of course, if you want the "real" thing, Silverton has live mermaid shows every Thursdays through Sundays. Check the website for the exact times.
Silverton has a theme that you won't see anywhere else. The casino is not very large and the aquarium is not comparable to the girth of the Shark Reef at Mandalay Bay, but it is free and a nice getaway from the Strip casinos.
(PHOTOS: VegasChatter, Silverton.com)