There is nothing worse than physical work that exhausts you, so my idea of an ideal job is neither an extremely active work, nor a sedentary job, but something in between.
Furthermore, work should be fun. You may not agree with me, but I think that as long as you enjoy your activities earning little money, you can call the work your dream job. However, the pleasure I am thinking of does not exclude stress or barriers, because work otherwise would be aimless and without any outcome.
The ideal job I have in my mind is being a flight attendant. It is true that it is tiring to face passengers, even those who behave badly with a smiling face all the time but I would get the chance to travel around the world, and that is, in my eyes the best job.
If you ask me, a dream job is not only related to earning a lot of money, but it also includes to enjoying your work and life by what you are doing!