My family lived in Las Vegas for a year! There is free self-parking at the Bellagio on the strip if you want to just leave your car at a central hotel and then explore the other resorts and casinos. My favorite free sights on the strip are the Bellagio foundations and indoor garden, the shops at Caesar's Palace and Miracle Mile, and the inside decor of New York New York and Paris. If you are willing to pay, I recommend Shark Reef at Mandalay Bay and the rides at New York New York and Stratosphere. If you want to see old school Vegas, go to Fremont Street. Have a great trip!