Hike in on the Caste Lake loop. You will need to look up trails starting from either Lolo Pass or fire road #27 off hwy 26.

Its a very beautiful, very secluded place right. Several campsites are set up right on the water and others are away set back in the trees a bit. Probably 5-6 total sites. Fire pits are constructed of stone. No water other than from the lake. Its real bare bones but if your into backpacking in, its pretty cool! Remember to pack out all pack in. Cheers! Ps. During mid summer be ready for skeeters...