My DS10 is type 1 diabetic as well - and believe it or not he's willing to take an extra shot of insulin and have that Mickey Bar then to snack on the carrots or pickles that we pack for him. As he says, he can only get some of this stuff once a year - last year he was addicted to the Zebra Domes at AKL and enjoyed them every day.

We make sure we place a grocery order that includes sugar free jello, string cheese, lunch meat, pickles, carrots, and such to have in the room and then he'll bring some to snack on during the day.

Surprisingly, his sugars run pretty close to normal while we are there -- I think all the exercise and adreneline offset the couple extra snacks for him.