[Sam:)]

Not having your own bed
The feeling of 'forever travelling'
Not being able to drink tap water
Competing for the sun-loungers
Lack of a decent cup of tea
No internet
Not always having a car
Bumping into other Britons
No decent shower or bath
'Strange' milk
Not having your own kitchen
Missing pets
Wasting money on unnecessary items
Cost of phoning home
Missing your family
'Weird' food
Weather is too hot
Not understanding the language
Struggling with a foreign currency
Not having your daily routine

The ones that apply to me are in bold