You decide that waiting is the best option. Better to avoid the people in the museum.
TWO HOURS LATER
The Smithsonian has closed and you decide to go in. You noticed that one of the back doors was left slightly ajar. You head inside. From here you have two options: Try to avoid the cameras and make your way to the Hope Diamond, or you can look for the security room. From there you would be able to find a uniform and see how the cameras are positions. However, it may be a riskier approach.