The hoover damn is a great place to bring the family and is one of the largest american constructs in history. They have a small/simple restaurant inside so if the kids get hungry you'll be able to snack on something while your there. Its a truly beautiful attraction if your in Las Vegas and is only about an hour from the strip. I rented a car with a friend when i was there and it was really easy to get to! I also recommend checking out the Neon Boneyard, which is an outside museum of all the retired Neon signs from the old Vegas casinos! It's really cool looking and you'll have tons of photo ops!