Did you bring any fly fishing gear? The GreyReef section of the North Platte river is just a few minutes from your camp site, and they have opened up some new wading sections above the "outhouse" and PMD holes. You can hunt during the day, and then throw large streamers near the greyreef dam at night, when the big browns and rainbows come out to feed. Wading can be tough at night around the dam, so be sure to drink plenty of whiskey (it helps you stay in the water longer...). The flows are ideal for wading now (around 500 CFS), and the weeds are mostly gone.
Just a thought...
If you like your hunting rifle, you can keep your hunting rifle.