I had a day in Gibraltar a few years ago - nobody bothered to tell them that Britain doesn't look like that any more. They need more temporary traffic lights and stop painting stuff to get a real Brit experience.
Ok to try "local cuisine" when on holiday, but not if the effort not to gag on it is making your eyes water (happened to me). If it's taking you too far out of your comfort zone it'll stop feeling like a holiday and more like a challenge.
When dining in a hotel or at a restaurant I suppose you can get away with leaving stuff you find inedible, but last year we stayed at a boarding house in Calais, which took 'personal touch' to a new level (the hosts dined with us). I ended up hiding some stuff in my pocket to avoid causing offence :doh: For example the cheesecake they served was salty rather than sweet, and smelled slightly of poo. That was a real challenge.

