Here are our recommendations for things to do while you're out in Las Vegas!
Whatever you enjoy, Las Vegas most likely has a show for it. Be mesmorized by the acrobatics of a Cirque de Soleil show, laugh at some of the top Comics around, enjoy some more unconventional performances like Jabbawokeez, catch a concert, magicians and illusionists, or a variety show like "V". If you have the time, we highly recommend seeing one.
Check out www.vegas.com for tickets and showtimes.
Take a ride over to where the original Las Vegas all started- Downtown. Catch the glitzy lights, the old school neon, and overall craziness of what Fremont Street has become. There are street performers, a huge light show canopy, a zip line that goes over the top of it all, and a plethora of other attention grabbing things. Plus a lot of the casinos there have lower limits if you're not looking to break the bank at the tables.
Also, we do suggest stopping by the newest property down there "Circa", as it pays homage to the old school Vegas but with a completely modern design (and probably the coolest Sportsbook you'll ever see!)
You don't need to spend money to take in some amazing attractions and sights. The Mirage has a Volcano show with fire and an erupting volcano every hour each night between 8pm-11pm. The world famous Bellagio Fountains go off every 30 min on the weekdays and every 15 min durign the weekend (starting at 3pm). Caesars has an animatronic show within the forum shops, the Wynn has the "Lake of Dreams" show every half hour, and the Flamingo has a free wildlife habitat with actual flamingos to see. Be sure to check out the Bellagio Conservatory as well, just past their front desk.
Got some time to kill before your flight back or just a big fan of classic pinball games- you should definitely check out the Pinball Hall of Fame. It has literally hundreds of pinball machines from as early as the 1950's all the way through modern machines- and they are ALL playable!
There are a ton of things to do, too much to list here. Below is a good reference video to some more as well.