Getting out at Birch Creek, we don't have a motor yet. We're planing on staying at the Hike-Out camp site, the Ryegrass Left camp and hike to Chalk Basin the next day for a light day to Potters Cave, and finally our last night at Upper Greeley at the other hot springs. We want to be close to hot springs since weather can be pretty variable as well.
Do you know if camping is allowed at Potter's Cave? It doesn't have a camping symbol on the map, but I have seen others' photos camping there. If not, I will definitely look into your Whistling Bird campsite! I've read that the waters can be fluctuating and this trip definitely depends on whether or not we have any.