Do have lots of fun. Don't worry too much about it. And other rules to live by.
It is best to avoid bringing personal electronic items into the casino. Hotel security is always on the lookout for photography and video of casino machines and tables and will quickly remove persons doing so.
All players must be at least 21 years old - no exceptions.
You are in a desert, and your body will need fluids, especially in the summer months. Carry a bottle of water, and be sure to bring sunscreen.
The high-concentration areas of Las Vegas are among the safest places for visitors in the world. Security is tight, but that doesn't mean you shouldn't take the same precautions that you would at home. Be aware of your surroundings and stay away from threatening situations. If gaming, keep an eye on your purse, change bucket or chips. If there is an incident, police and security personnel are generally highly visible.
Generally speaking, smoking is permitted on the casino floor at most resorts, in some guest rooms and in bars that don't serve food. It is not permitted in public areas such as restaurants, hotel lobbies, the Las Vegas Convention Center concourse areas, or McCarran International Airport.