Wow! I hope it's not too late, but when I saw the picture of the note on the windshield, and saw that the car was a Saturn (thanks to billgates380 for rehosting), I got dressed and went down to my Saturn to see how to open the hood from outside.
You need to lay down on the ground and reach up from the lower left (driver's side) corner of the bumper cover. If you reach up from too far to the right, your hand will end up on the wrong side of a plastic shield.
Reach up to just behind the center of the headlight/turn signal module. Feel for the hood release cable. It's the smooth one, like a bike cable. Any textured cables are just plastic covered electrical wires for the headlight and turn signal bulbs and you don't want to pull those. Pull the smooth cable toward the driver's side. The hood should pop right open. I just hope it's not too late.
PS, no wonder the owner never drives it, stupid Saturns don't get driven more than necessary, since they're not that fun, not that cool, they're loud, they leak in the rain, the interiors and switchgear are chintzy. . . Need I continue?