FWIW, The ink from the Industrial line of Sharpie Permanent Markers holds up noticeably longer/better than the standard Sharpies. They are usually available in stationary shops and distinguished by the red labeling on the pens (rather than black labeling of the standard version).
I am pleased to announce that there is now an official opening set for Rainshadow Disc Golf Park in Sequim/Blyn Washington! An open house is set for July 26, 2017 at 11:00 AM. The park and course will be open for play shortly after a brief ribbon-cutting ceremony. I'll set up a DGCR profile...