The main danger when using lasers inside is reflections - it's fairly easy not to look directly into a beam, but much harder to avoid a beam that's accidentally reflected off a shiny metal surface, or a window. Outside, this isn't so much of a problem - as the further a beam travels, the more it spreads out.
Outside - the danger shifts somewhat from your own eyesight - to that of other people and animals. The sky's a busy place - It's dangerous to point lasers at planes and helicopters for example as it can dazzle the pilot. When outside - you can use far away trees and mountains as a safe beam-stop, but you should be careful and not point lasers at other people's properties or anywhere near any other people.
a "200mw" (it's more likely to be between 50mW and 80mW, as the vast majority of mass-manufactured inexpensive 532nm medium-high power lasers are) green will look very striking outdoors. The human eye percieves light of different colours at different intensities - so the Green will likely look comparably bright to the blue - even though it is much less powerful.
