May not be the worst of all, but I went to florida with my WHOLE family (Sis,Mum,Dad,Aunt etc...) to Florida, amazing place, but for 3 days it was raining so heavily and thundering plus lightning near the villa we were staying at! Not only that but there were alligators outside practically every night about 10 feet away from the mosquito net fence to cover the pool. Might not sound like a nightmare and i cannot call it a nightmare but it was pretty horrible for those 3 days. Other than all this the family had a good time and myself! This may not be what your looking for, but this is the only WORST experience ive ever had on holiday! Crazy right?