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I my opinion these are goals that can be achieved one at a time. You may have children, bring them up, enjoy family time with them, and after they leave for college, you may start traveling.
Or you can reverse the order. First travel and get the traveling bug out of your system, and then have children.
I recently watched an interview of Dana Bash, a journalist at CNN, who has a young child and is on the road most of the year. She obviously has solid help at home, and, from what I saw in the video, she stays in touch with her child and spouse through Skype. This option may or may not work for you.
Another option may be for you to live near nature. This way you may enjoy being in nature and among animals during the day, and spend time at home with the children. Working at a zoo may be an option, though this idea excludes traveling.
I would recommend that you talk to people who work with animals and who travel a lot. I am not sure how old you are, but keep in mind that traveling constantly is not physically possible for everyone. I, for one, am not cut out for constant traveling. I am quite sure that if my job required it, I will end up physically fit. This does not mean that you cannot do it, but it is simply something you need to pay attention to.
Best of luck in your search.