I just got back from my first MFS trip last week. I only saw a few campsites, but from what I can tell, all of them would are awesome.
We stayed at sunflower one night which has a great hotspring pool and and shower. It is likley too small for your group, but there is a site directly across the river you might be able to stay at, then just paddle over for a soak either in the evening or morning.
There were also some nice looking sites upstream of ski jump near the confluence of a tributary. Another one we stayed at was the the cliffside campsite, which was really nice! The rangers were also very helpful in selecting some sites if you give them some criteria like daily mileage, need for side hikes, ect.
We stayed at sunflower one night which has a great hotspring pool and and shower. It is likley too small for your group, but there is a site directly across the river you might be able to stay at, then just paddle over for a soak either in the evening or morning.
There were also some nice looking sites upstream of ski jump near the confluence of a tributary. Another one we stayed at was the the cliffside campsite, which was really nice! The rangers were also very helpful in selecting some sites if you give them some criteria like daily mileage, need for side hikes, ect.