Thanks for all the great replies. I have done a very rough count of recommendations:
USA 12+ including national parks, Lafayette, New Mexico etc. I guess this may be a result of the strong US base of RFFers.
Italy comes in 2nd place with 6 or more.
Those others mentioned more than once: Japan, France, Switzerland, Canada
Those mentioned once: Spain/Barcalona, Mexico, Austria, Iceland, SE Asia, Vietnam, Holland, Iceland, Central European countries, Russia/Moscow, Cuba, Guatemala.
Japan is definitely on my list. I may combine it with a stopover on the way (my wife likes the idea of Vietnam). I would like to revisit the US. I have been several times, but only to cities (Chicago, NY, Washington, Boston, Las Vegas) and often just for work apart from Chicago and NY. I have several friends in Chicago, but it looks increasingly unfriendly nowadays and they seem to be moving out to Evanston and Skokie rather than staying nearer the centre - I haven't been for nearly 10 years. US national parks might be something to target. We are also considering a safari in southern Africa. My wife also has mentioned Cuba.
I am going to Italy in September. As I live in Europe I can also easily reach many countries and I have visited every country in Western Europe and Scandinavia several times over. I am sure we will be doing several European city breaks over the next few years.
As to what I like to photograph I would probably like to do more street type photography, but at the moment I am doing a lot of seascapes and landscapes when I travel.
As to what I like to photograph, here are some of my older 'vacation' shots:
France/ Leica M6
View attachment 4823134
Chicago (Buddy Guy's). Sony A900.
View attachment 4823135
India/Kerala. Ricoh GR digital.
View attachment 4823136
Morocco. Sony Nex 7
View attachment 4823137
Spain/Cadiz. Nex 7.
View attachment 4823138