I haven’t spent any time in the Absarokas so I can’t help there.
As far as a specific area around Dubois, thats tough, just because theres so much country that I haven’t see up there. But a good place to start is wilderness.net and look up the Fitzpatric Wilderness. Plus their map server is pretty useful outside of designated wilderness area.
There might be some information on the Cloud Peak wilderness on there too.
It gets trick since your a non-resident. You can go in the wilderness areas and fish but come hunting season your suposed to have a guide. Strange rule that I won’t complain about until I move out of WY.