#1: My very favorite part is how you have bills to be paid, misery at work, women on the phone, family in trouble, but yet for the duration of a kayaking trip be it 3 hours or a month, you simply think about kayaking, scenery and your friends. No matter how bad the trouble is. No matter what I've done (lose jobs, girlfriends, and respect) or how bad I'm feeling before (aches, tiredness, wet gear, overcast) - I've never regreted a single day of boating or what I had to do to get there.
#2: Plus when you stomp and simply cannot deny the fist pump.
#3: The community of true friends who understand the above and have been trying since the first stroke to describe it to others. I've never not wanted to have a beer with another whitewater boater.