People without passports astound me. Perhaps it's unfair, but I instantly judge those people (sorry for those reading who fall into this category - but consider this an offer, get your passport and I will plan you one hell of a trip and show you exactly why it is so important and so fun to see the world!).
I have learned that I'm happiest when planning a trip - whether it's a quick two day stay or a 10 night trip to a brand new spot. I really enjoy researching places to stay, where and what to eat, how to get from one spot to the next and also to learn, in general, the history and background of wherever we're going. I like finding the hidden spots and going where locals go, getting a real sense of how people live their daily life.