Hi There, welcome back.
I dont know of any ranches where you can stay over but you can get a western trail ride at the Grand Cypress equestrian centre, all standards are catered for, and they do english style riding as well, its a British Horse Society approved centre so should be up to standard. It looked good when we visited in '98. I know if I was to go riding Thats where I would go. I'm a riding instructor by the way.
I hope you enjoy your holiday and it isnt too sad for you.