This is the 'Grand Daddie' of them all, and the largest Nationally. $100,000 worth of rods, lines, etc., for you to actually take to the river and test. The instructionals put on over Saturday and Sunday are put on by "People who know."
Cost? Park entry fee is about $4.00 .... that's it and they EVEN FEED YOU FOR FREE!
For a full run down, Google flyfishusa
Need a casting instruction? Just ask.
No gear is sold there, but you sure can find what you want to buy come Monday morning......