Steep mountains and very few lakes in the area.
Nahatlatch lakes. Reportedly not great fishing for trout, a few bulls though. Never tried myself.
Kwoiek Lakes, long drive, again not really 'trouty', very glacially influenced system. Quite scenic.
Blue Lake nearby has a resort, interesting scenery, and decent fishing for 10-14 inchers, haven't been there since I was a kid.
There is some quality fishing to be had up in the Seton area, but probably out of range. Again, quality fishing further up near Clinton, at the Big Bar/Little Bar Lakes area. Nice fish, probably out of range. If you're staying close to Boston Bar, I would personally stick to the rivers, or dump a tinny into Nahatlatch Lakes, just because I've never tried.