Lost keys with silver running shoe charm

Lost a set of keys while out running along A1A from Birch State Park (The Grove Cafe) to Lauderdale by the Sea (the public restrooms). And yes, I have retraced my steps, twice:(

The key ring had on it 2 keys, 1 FOB, and a silver running shoe charm.

The keys and FOB are certainly replaceable, but the silver 'running shoe charm' is a memento and a keepsake (it's a gift from over 20 years ago).