I think you mean saturns moon titan, because its the only one with a thick atmosphere
the funny thing is, because the atmosphere is so thick and the gravity is so low, that a person would be able to fly under his own power just by strapping a couple flimzy wings on their arms (think of the old footage of people trying to fly)
I also like europa, I hope we send a probe their, because if we find life, even if its just microbial it would send a shockwave through the world
thats not the only place, scientists now beleave that the first life may have begun in extremly hot conditions right near magma vents for example, an envirement almost exactly like Jupiders moon Io
there are alot of places where life could be, unfortunality it takes a hell of alot of money to send a probe to each one