I'd buy some mountain-top strip-mined land that had been reduced to moonscape, then buy several million blocks of ice and hire some workers to transport and lay out half of the blocks of ice atop the mountain so that they spell out the phrase "Melt!" when viewed from above.
The other half I'd have arranged to spell out "Melt!" vertically, in "letters" large enough in size so that it could be viewed from a Interstate highway and other points located many miles away from the site.
Having both viewing angles covered, while waiting for spring to come and melt the ice, I'd begin construction of the world's tallest
aeolian wind harp on the other side of the mountain, which would hopefully be completed by Memorial Day.
Then I'd wait for the either the aliens in a spaceship or droves of hippie chicks in VW buses to begin showing up... (in the best case scenario, both would)