Well this is totally absurd and I don't know if anyone even reads these but here goes.
You were working on something really interesting and I interrupted your creative time, then proceeded to dork up the remainder of your time at the park on Monday afternoon.
I'm sure I was plenty annoying but when you smiled and waved as you left my heart jumped all over the place. You'll probably never read this but if on the wild chance you somehow do, I'd be delighted to get to know you, maybe even trade some artwork.