I do have nice memories of campfires but I also think it encourages you to stay up far too late.  One of my favorite things about the outdoors is that it reminds you to sync your body to the natural rhythms of your surroundings, like high/low tide, sunrise/sunset, temperature fluxuations, etc.  There's nothing like a crisp early morning stroll to start your day, but I find myself sleeping in instead if I've been up late tending to a campfire.