Hi Di
Your paperwork says:
"You are allowed to take one piece of luggage per person inside the aircraft cabin, weighing no more than 5kgs. The maximum dimensions of your hand baggage must not exceed 56cm x 45cm x 25cm, including the handles, pockets and wheels. Your bag must fit into the bag gauge, available at the check-in area."
So I would say you will need to fit your cameras into your luggage.
As for safes, most of the hotels we use have them but, if not, you should be able to leave valuables with reception. But I expect you will want to keep your cameras with you most of the time anyway.
Kind regards,
Olly, your editor