Lots of access points at the ramps on the Hoh ... same can be said for ramps on the other rivers as well especially in light of the current very low water which makes wading easy. I can think of tons of spots that we always rip fish out of right near an easy access point ... yet I watch tons of bankies go right past them or not fish them correctly ... that's your ticket!
Explore, that's half the fun. When I first tromped around these parts back in the mid-80's I had a ball searching for 'e, and they're actually some of my fondest memories of the area. Knowing what I do now, I'm glad I didn't have someone to show me all the "secret spots" ... As for "secret spots", sorry, too many guys have worked their tails off breaking trails and the like to divulge 'em
Good luck