First Time Ever Saw Mr Green

I came back from Wallyworld today & found this waiting for me.
First time I have ever seen a drop of coolant under my antique, built like a Seiko watch VS. I have never given one thought about the cooling system before.

Figure out the cause?  Bad seal or crack in hose?

Since the weather is warmer, your coolant may be expanding and overflowing from the little plastic overflow pan/bottle on top of the engine.  I admit mine has never overflowed though the bike has been hot midsummer.  Ride it some more, then park it and watch for seepage.