Let's be honest: Las Vegas isn't exactly kid-friendly, especially since it stopped the whole charade of hoping/pretending that it was. But that's not to say there's nothing for kids to do, it just takes some thinking and planning, and on taking into account what the interests of this particular 11-year-old girl may be, since we'd hate to pigeonhole her. It also depends on what the adults in the party are into, of course, since we assume you're not just here to entertain your friends' kid...
If she's into animals and nature, you've got everything from Shark Reef (Mandalay Bay) to Springs Preserve (off the I-15) to Siegfried & Roy's Secret Garden & Dolphin Habitat (Mirage) to the great -- free -- aquarium at Silverton, with its regular feeding times, to name just a few options that should all deliver an hour-or-two's diversion and a memorable experience.
Does shopping make her tick? You can lose hours in the Fashion Show Mall, or Miracle Mile Shops, or the designer outlets downtown and out at Primm, not to mention some fun local boutiques, like Patty's Closet (several locations). There's a nail salon in every strip mall, practically, so you could treat her to a "grown-up" Vegas experience and get her a sparkly "showgirl" manicure.
At that age, pretty much all of the city's thrill rides should be open to try (some have height restrictions), so take your pick from an array of roller coasters, zip lines, go-karts, flight simulators, and more -- you'll find details of all in our Rides & Activities section.
For something more sedate, how about a gondola ride at Venetian, or some miniature golf, which might be fun for the grown-ups, too? (This is Vegas, so we have Egyptian-themed glow-in-the-dark putting, or KISS-themed rock 'n roll putting, among the options to choose from.)
There are some child-friendly shows worth checking out, like Mac King's afternoon comedy magic at Harrah's, or the Gregory Popovich Comedy Pet Theater in the Miracle Mile, which are fun for adults, too. It's your call on whether Cirque might be her cup of tea, but if so, we'd particularly recommend KA at MGM Grand, which has cross-generational appeal.
Depending on your budget, a helicopter tour of the Grand Canyon is one of those once-in-a-lifetime experiences that an 11-year-old could appreciate, or you could opt for some more economical indoor skydiving. We've also go paintball, Laser Quest, and indoor rock-climbing centers, which can be fun for everyone.
Pool season is underway and several of the city's family-friendly facilities, including The Beach at Mandalay Bay, admit non-guests for a daily fee. Check out our Cool Pool listings for details on which are open to the public and how much they charge.
So, although we're all still impatiently awaiting the debut of our new water park (now postponed until 2013), not to mention the new observation wheel(s) in the works, you shouldn't have any problem keeping the junior member of your party amused. Be sure to check our Events listings, plus Today's News, for information about specific one-off events or seasonal attractions in the run up to your trip.
You'll find details of all the above suggestions, plus many more ideas, in our Visitor Guide, where you'll also find details about childcare options, should you have need of them. Wishing you all a fun visit!