The scenery is important but for the most part to me it's about the local people. Try to avoid countries where the local religious custom includes a desire to if possible chop your head off, so most of the Middle East and parts of Asia and Africa I'll avoid.... this extends to airlines like QF en route to Europe who think it's great to transit what to me are loathsome places.
Only went to Bali Indonesia once and much of the countryside and wildlife is very beautiful but I found so many vile people there, I left with no respect for them and have little desire to return (see above). They trashed their own countryside and I found them corrupt, untrustworthy and dangerous. Yeah I know there are some nice ones but they aren't doing much to curb the thugs and creeps. Also NYC, an interesting city but dirty and so many rude people, pass.
Favourite destination city would be Bangkok, in no order wish to return to NZ, Vietnam, rural Germany, Alaska and Hong Kong and certain states in the US like Kentucky, Florida and Utah; wish to visit Japan, Canada, non-Moslem parts of France & same in northern Europe. Would like to travel more around Australia outside of the major cities but find it's too expensive with family & no time for a caravan tour.