I have been thinking about Trump's Wall.  If we built it, it should be a tourist attraction!  People pay to walk on the Great Wall of China.  So, here's my stupid idea of the day.  Make the wall wide enough so that on top there is a bike path, bathrooms, and places for food stands.  Maybe even food trucks.  Even better.  Step aside Elon Musk.  I don't want a hyperloop.  I want water slides for commuting!  Imagine commuting between cities via really long water slides.  Slides that go in both directions.  And so people don't get sunburned, they would be shaded by solar panels.  The panels would power the wall.  And we'd sell the excess electricity to Mexico!