Missoula Area

Can someone help with some good spots to camp around Missoula that get you away from the crowds?  We are planning a trip to include mostly fishing however wanted to mix in some hiking, both day and over nighters.  We also wanted to fish the Big Hole, so any recommendations that way would be great.  

The forest service guy I talked with informed me about the Rattlesnake Rec Area, said there was some good hiking and lakes to fish???

Thanks in advance.