I have never had an irredeemably bad holiday.
I remember my childhood and early teen holidays with immense fondness. Me, my folks and sister camping in France, Germany, Holland, Belgium, Luxemburg, Denmark or Sweden and just spending two weeks riding bikes to different places. The best trips involved 2 or 3 different campsites and some driving for dad in between and a visit to our friends in Holland or Belgium. My grandparents would often supplement with UK holidays with lots of history and trips out.
Favourite places as a grown up have to be
the trip with Mrs GD to Cape Town, Cederbergh etc where we got engaged and
Anywhere with the 2 boys in tow (we could camp in the garden and it would still be awesome)
I really liked Vancouver and Banff