Ive attended many school field trips, especially ones involving traveling. My advice to you is to allllways keep quick reacting sweets with you, regardless of how much candy theyll give u! Because perhaps you'll go for a walk after the meal and you might get a low then. I never really tested myself that often, as I used my own gut feeling unless I was back at the accommodation, but of course its advisable to keep your meter with you and some extra strips. Also, the more sweets you carry, the more flexible you are, as trips dont always necessarily go according to plan. And aaalways make sure you have enough insulin on you before you leave your place.
As a diabetic you should be able to do most of what the others do, nothing stopped me aside from lows of course, where Id then wait a couple of minutes till im ready to carry on.
Also, beware of trampolines! Once on summer vacation I was on the trampoline with my cousins and my blood sugar would just keep dropping very quickly no matter what id do, always make sure u have enough sugar on and in you!
Hope I helped!