If you are interested in going rafting Matt and I highly suggest going on the Middle Fork or Main Salmon river. This is a place where Matt and I's love continued to grow for each other and the stunning canyons. We both work for ARTA river trips, so we are obviously biased but it is truly a great company to go with :)
This is a beautiful hike near Stanley. It is 4.5-mile out and back trail, generally considered an easy route, it takes an average of 1 h 35 min to complete. It is right near Redfish Lake, so if you are sightseeing or visiting the lake I highly recommend this one!
There are wonderful hot springs outside of Stanley. Boat box hot springs, and Sunbeam hot springs (right down the road from Stanley). Bonneville hot springs (45 min from Stanley), Kirkham hot springs (1 hr from Stanley). There are so many more depending on where you are traveling from. If you are driving from Boise I highly suggest keeping your eyes open when you are traveling through Garden Valley Idaho, there are so absolutely amazing hot springs along the Payette river.