Hello Ella.
Alton Towers eh. I shall assume you will be running around, going on rides and being very pro active with your friends, not to say excited !
I wouldn't change your ratios but if possible I think it would be a good idea to check your sugars every now and then to ensure they are not dropping too low. If your enjoying yourself time seems to fly and you might forget the basics !
Carry some sweets on you (jelly babies or fruit pastilles) or a drink (like a Capri Sun) that you can fit in your pocket or bag just in case and try to be more aware of your warning signals for hypoglycemia.
Everything should be ok Ella if your careful and take responsibility.
Above all have a wonderful day and I hope you enjoy yourself
.