For me it is a combination of walking and using different types of public transport. If I travel in Sofia and I have to go from A to B, some of the most enjoyable things for me is finding the fastest route. Most of the times taking a single bus or train will be slower from taking bus for some stops, having a short walk/run to another bus. Or in the country traveling with just a backpack, taking buses, trains, walking or taking a car ride with a random driver, stopping for a rest wherever I want... That is what I really like and now when I am a parent I can't do.

If anyway I have to chose only one, that would be walking. From a kid I am raised to spend a lot of time walking in the mountains and also I am born in a town where I can reach everywhere by walk in a short time. That is now part of me and will always be my favourite.