Humour me please, I'm bored waiting for a flight.
My worst was Tunisia in the 90's. Out of season, terrible food, felt like we were locked in a resort at night. Couldn't wait to go home.
Best - California road trip with the kids a few years ago. We all loved every minute of it. So much to do, the food was great and lots of swimming and lovely beaches. Monterey and San Diego were our favourite places.