You can find a detailed description of the bee's knees as a term at Wiktionary .
In general, it's something that is cool or hip or wonderful.
This cache isn't the bee's knees. But it is the bee's knees because I named it that.
Please park at the noted parking and walk the short distance to ground zero. This road gets more traffic than you might suspect. I walked behind the guardrail although the plants might become a problem.
Congratulations to MidnightsRaiders on the FTF.