Hi,
@Hollieo4 , the heat is a big part of it, I generally knock my insulin back a bit when it's hot, but also remember that exercise is part of the triad of food/insulin/exercise you need to think about. Never underestimate the effect which exercise has on the amount of insulin you take.
When I say exercise, that's not just going to the gym or for a run. You're on holiday, so you're maybe walking around town doing a bit of sightseeing, going for a swim off the beach or hitting the nightclubs doing a bit of dancing. Those all count as exercise and all will reduce the amount of insulin you need, as well as the reduction you might need for the hotter weather.
Plus you're maybe drinking a bit more - what holiday would be complete without it - and the alcohol will throw things out a bit.
And, if I recall correctly, you're recently dx'd so you'll likely have honeymoon adding it's bit of uncertainty as well!
When I'm on holiday, I'll spend hours wandering around whatever beautiful city I'm in, taking in the sights. You'd never usually think of a slow daunder as exercise, but it is, and as it's more than I'd do at home, I'm then thinking, ok, been trotting around this place for a few hours, so I'm going to rake a few units of this next meal, even though I've had a couple of bolus-less ice creams along the way.
Obviously can't advise on dose, but, generally, don't be shy about ramping back your dose heavily if you've been walking/swimming/dancing more than you'd be doing at home. Remember that there can be an after-drop quite a while after exercise, so if you're sitting looking at an evening meal and wondering what to bolus for it, remember that you may well need to shave off even more than the 2u you mentioned to get the dose right. Don't just look at it as this size meal, so this size bolus: look also at what you've done in the last 6 or 10 hours and adjust for that also.
It's all trial and experiment, this stuff, but hats off to you, kiddo, you've gone abroad after a recent dx, figured out how different states need different responses, asked for advice: that's the key to living with T1 - it's a moving target, so move with it!
Anyway, look on the bright side.Going hypo all the time: fill yourself with ice cream till the crisis is over!