Glad to see someone else mention Malta.
Humidity so bad that rain would have felt dryer.
Rubbish thrown out of windows onto the streets like in medieval times.
Maltese barmen with cockney accents because they hear the London accent more than their own. There was probably only three people in the hotel who weren't from London.
Blue Lagoon beauty spot full of floating rubbish and human waste.
The smell from the sewage works that's quite close to town. Well everything is close to town. The whole island is the size of Cardiff.
Tiny over crowded beaches.
Cockroaches scurrying around the room. That only paused slightly when you stamped on them then kept going.
A room overlooking a roof with an aircon unit on it that sounded like a Boeing 747. Not that we had any aircon.
We had to argue like hell to switch rooms.
Malta wasn't the worst holiday I've been on because I was young and made the best of it. But it's probably the worst location I've been to.
I'm glad you've said that, because we once went for 2 weeks to mainland & Gozo & it was just a massive dustbowl, but everybody else I know who's been goes on about how great it is. Some people just have no standards.
But I wasn't very cheery, what with being suicidally depressed, and my step-mum took exception to that. She used to wait until my dad was at the other end of the boat, and then sidle up and criticize me and tell me to stop ruining her holiday. To be fair, I only wanted to sit in the shade and read, and listen to my discman. I'm sure I was playing something morbid like Silverchair on repeat, and being a real downer, so I do see that I probably wasn't a pleasant holiday companion.
Anyway, one day we were moored in a harbour with the rest of the flotilla, when she sidled up and started dripping poison in my ear. One thing she suggested was that I should cut myself, as it might make me better company if I gave into my self destructive urges.
I snapped at this point, and stood up and called loudly across the boat to my dad, "If you don't shut this bitch up, she's going overboard!".
My step-mum was yelling "Oh god! She's threatening me! She's mental!" 
