You may not think of a city known for catering to high rollers as a
budget-friendly destination. But there are plenty of things to do in Las
Vegas that don't cost a dime. Take in the aquatic action at the free
Silverton's Mermaid Show. At various times Thursdays through Sundays,
live "mermaids" drop into a 117,000- gallon aquarium for a swim with
stingrays, sharks and thousands of gorgeous tropical fish
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