Well, firstly we discovered that the dam was named after Herbert, US president and not J Edgar, cross dressing racist homophobe (and director of the FBI). We also found out that I was the only one that knew this, the 3 Americans being confused. Lake Mead is the reservoir created by the construction of the dam, a new deal thing in the 1930s, staffed by hundreds of desperate men who brought their families to live under canvas in a desert valley with no shade. We had lunch on the lake with fish begging crumbs and then Sherry, Dan and Christopher went swimming in their underwear. I decided my underwear was not up to it.