I am an occasional (and fairly terrible) golfer. I played a round the other day and was confronted with an odd situation. I sliced a ball through some trees and onto the adjacent fairway. I still had 200-250 metres left to the pin after this shot. When I got to my ball, I noted that the trees between me and hole or the fairway of the hole I was playing were thick and high, whereas about 150 closer to the hole, the trees really thinned out. I therefore played a shot up the 'wrong' fairway to a position where I could relatively easily chip to the green through the sparse area of trees.
This was a social game, so I wasn't too worried, but was what I did legal under the Laws of Golf? Is there any compulsion to play along the 'correct' fairway when possible? Also, aside from any letter of the law considerations, what etiquette issues might doing this present?