I think that, in general, parens should not be used in names. For each of these locations, I'd put the primary version by itself in the name field and the version you have in parens as an alt_name value.

I looked to see if there were ISO language codes for Acjachemen, Luiseño, or Tongva but apparently there are not. If there were, then the primary name should also be put in a name:isocode field.

The way would be way/1377679079

People have hiked all over these hills and there are at least some published descriptions of hikes from PMC to the top of Mt Pinos, Sawmill & Grouse. But those are, at best, routes rather than trails.

I harbor a strong suspicion that your route up from the trail into Wind Wolves to the old 4x4 track on the top of the ridge falls into that same category.