When you say a "problem" with a small area of your large intestine,are you saying that it is the UC that is back or is it somthing else?
I am sure that the Doctors have there reasons for suggesting surgery but I would find it highly strange if it was because of UC being in a tiny area of bowel,and it isn't even causing you any problems.
I know that having UC for ten years or more does put you at risk of further problems in the bowel,but I would have thought that reguler Colonoscopy's and blood tests would be all that you would need if you are not experiancing any symptoms.
If I was you I would ask the Doctor to explain in more detail exactly what they have found in your bowel and get them to explain to you properly the reasons why they think you should have the whole of your Colon removed.
Please let me assure you that surgery does not mean the end. If I hadn't had my Ileostomy nearly 2 years ago I would never have been able to take a Holiday if it meant flying abroud because I was never well enough with my Uc. This year in June, I had my first plane trip to Menorca and I had a great time. I decided not to go for the J pouch although I could have had that option but that is another story. If you would like to know more then feel free to ask away but please please don't think that that Surgery,and even having a bag like I have is the end. It certainly wasn't for me,it was the beginning.