So you hunted two or three days and didn't kill a deer, I hate to seem unsympathetic but...big deal. You enjoyed time in the outdoors with a son who is enjoying hunting, I believe all young people should, as my Dad used to say 'get some more squirrels under your belt' prior to deer hunting. So many young people today start with deer...a mistake in my opinion.
I've been blessed with countless hunting success but I can tell you this...among my fondest memories were hunting small game with my Father, even as he was hunting deer while demanding I hunt small game until he determined I 'was ready'. Don't become so consumed with killing a deer as to lose sight of the memories that you stand to create right now.
You're in an area where, in time, you will surely score. Enjoy your campfire, grill some steaks, buy some cool gear for yourself and your son, preach safety and ethics, have many laughs...you're storing up riches in memories, the success stories will surely follow.