1 Reapply sunscreen after 30 minutes of your first exposure to the sun, and then again every two hours as long as you're outside.  Apply a sufficient quantity of sunscreen. An average-sized person should apply an amount equivalent to one ounce (approximately a shot glass size)
Secret #7: The structure below Jefferson Ave. Some people don't even realize that there is a parking structure under East Jefferson, just east of Cobo. It's the underground lot that was meant to serve the Ford Auditorium and it will cost only $10 to park there for an entire day.
How Much: Itâs FREE to walk or drive across Hoover Dam and the Colorado River Bridge. However, there is a charge for parking, the visitor center and tours: $10 for parking. If you donât mind walking, FREE parking is available farther up on the Arizona side. $10 per person (ages 4 and up) for the visitor center.