Don't rely on your toddler to nap on the plane. We flew with DD from 8 months onwards, various times and even later than usual bedtime.
I think the only time she slept was a fairly early morning flight where we got off at 5am from home. Being on a plane is far too interesting to nap.
Have the favourite cuddly toy in your hand luggage. Change your baby's nappy just before boarding as the plane toilets are a pain.
We always have some dry foods like muffin, croissant, fruit with us for DD to eat. We normally fly scheduled flight, not charter so meals are not provided for European flights and if than it is useless. If necessary we buy additional ones at Starbucks, Costa or Pret after security.
Take a tablet or laptop with you for some small movies, the Lo can watch without sound, get headphones for the older one if you don't have any. Sticker books are great, cheap crayons and a notebook. Don't forget to add something in the luggage for the flight back, English magazines and books are very expensive abroad. My DD still loves to study the emergency evacuation leaflet.
Do not take toys which makes noises. Not only will your fellow passengers be thankful you will hate it as well.
For Cyprus, get UV50 suits for your children. They will not play in the shade, they will want to play in the water. A sunhat and factor 50 sunlotion is a must. I normally dress DD in T-shirts and shorts or a dress with small sleeves to avoid the sun as much as possible.
Go with the flow, if they go late to bed or eat not their usual stuff just think that in 2 weeks you are back home and life will be back to normal.
Enjoy.