I hear you. Only pitifully short walks for me. When I started this I had this hope that may be being out in clean, beautiful nature would somehow transport me back to health. That didn't turn out at all! Just being out here has its own rewards though.An ME friend tells me I'm lucky I can still travel - doesnt feel lucky when you sit in a car when your family are talking a walk you can no longer manage. But I'm also off to see the Rockies this year - did Vancouver Island one September to see brown and black bears. Have to do what you can.
Couldnt camp, my bank wouldnt like it - but I do think air conditioning is bad and being out in fresh air good. I find some places better than other - on Rhodes (that's Greece, btw) I felt almost well for the first week and even walked up some (low) hills. That might be a trip too far for you though.
Cows dont like dogs, especially when the cows have young. I'm surprised you havent had trouble with them before.
My partner visited Greece when she was well - she loves it. Maybe some day. Maybe that dry clean air was good for you....
Glad you are seeing the Rockies