I've hunted back behind Atlanta. There's a trail head that goes back into the Sawtooths. That always looked good to me but I've never been there except hunting. The drive back over the pass is nice. I don't now if it's open yet but I would think so. I can find it on a map if you're interested.
Trinty mountian and the lakes in the back country might be open. Everyone camps at the easy road access lakes but not everyone hikes back to the other seven lakes.
Looks like you had a great time. So, how was the rattlesnake?