We stayed at Geronimo Creek in the off-season and in fact it was right down at freezing one morning, which made the deck outside an ice rink! We were in Laughing Water cabin and it was lovely & cosy inside. Very comfortable accommodation, big beds & solid furniture, clean and well kitted out including TVs and radios/iPod connector, kitchen appliances and even some boardgames. It would've been lovely to enjoy the creek but all we could do was admire it from the deck; we did have a brief swing on the hammock and swing seat and had a game of table tennis in the common area. With more time, we would've tried the hot tub.
A minor irritation was that the wifi only really worked in the common area but being a retreat, it was probably just as well! And we would've struggled to find the place without sat nav - again, it's not called a retreat for nothing!
I'm not sure if and when I'll ever be back in the area but would happily stay there again.