It’s pouring as I type, so major systems like the Root and teh WW won’t be clear too long, but the upper headwaters will be fine very quickly.
Actually, I think if you’re going to give a beginner the best chance at getting a grip on casting, mending, etc., go with a medium to medium fast action rod, 9″, in the four weight range and do streamers last. Dries are fairly easy since they weigh literally nothing and novice casters can throw them relatively easy. Nymphs (not necessarily a tandem rig) would be my next choice, followed by streamers. The only reason I would hesitate on streamers with a first timer is that there is a lot of hand/hand coordination – false cast, cast, retrieve via a stripping method of some kind.
Just my two cents; good luck ,
D.A.