While I explore, I read all the notes and e-mails and try to figure out if they lead me to something valuable or strange [without starting a quest]. I love following those leads and finding places which are not (and won't) be marked on the map.

True, but i do find the Main Quest of Fallout 4 to be way better than Fallout 3 and slightly better than New Vegas, my opinion.

All the better! What′s the point of a poll if everyone has the same opinion?

Exploring along with side quests. I like the random quests you get from the radio, or where you just stumble onto something really strange or fun or dark.

Oh, and crafting chems. Love that stuff.