Travel for me. I have visited 22 countries in every continent except Australasia. When I was 18 I left home for the first time (I am from Wales) and bought a Greyhound bus pass and travelled across the USA from the East Coast to the West Coast and back again. I spent a few months in California as part of the trip. Hated LA, but loved San Francisco. I have been back to the States since visiting Detroit, New York and Boston on a number of occasions.
My favourite countries though are Egypt and Inda. Both countries have a fasinating history of course. Most people speak English and the Egyptians, in particular, have a fantastic dry sense of humour. See attached picture of me some years ago at the Suez Canal.
I haven't visited a country I didn't like. I find most people around the world to be warm and friendly. Sure, there are rotten eggs in every society, but I feel very positive about humanity in general.